High-power-density charging control device of satellite power supply system

Abstract

The high-power-density charging control device of the satellite power supply system comprises two paths of charging regulators which are in a mutual backup relationship; the charging regulator comprises a charging enabling switch, a charging regulation circuit topology and a charging mode selection switching circuit which are connected in sequence; the primary bus VBUS is input into the charging enabling switch, and whether the charging adjusting circuit topology works or not is determined by controlling the on and off of the charging enabling switch; the charging regulation circuit topology is used for converting the electric energy of the primary bus VBUS to obtain voltage and current suitable for charging the storage battery A and the storage battery B; the charging mode selection switching circuit is connected with the storage battery A and the storage battery B; the charging mode selecting and switching circuit receives electric energy of the charging adjusting circuit topology, and the charging requirement of the charging adjuster for the storage battery A and the storage battery B is met by controlling the charging mode selecting and switching circuit to be switched on or switched off. Compared with a traditional satellite power supply system charging control device, the power density is doubled.

Description

Technical Field

[0001] This invention belongs to the field of space power, specifically relating to a high power density charging control device for a satellite power system. Background Technology

[0002] Most satellite power systems use solar array-battery power systems, among which S 3 The R (Sequential Switching Shunt Regulator) architecture is simple in structure and highly reliable, and is widely used in satellite power systems. To control the stability of the bus voltage, S... 3 The R-architecture power system typically includes a shunt control unit, a charging control unit, and a discharging control unit. For high reliability, the charging control unit usually has two sets of batteries, each with its own primary and backup charge regulators. However, this configuration requires at least four charge regulators, resulting in low power density and failing to meet the trend towards lightweight satellite power systems. Summary of the Invention

[0003] The purpose of this invention is to provide a high power density charging control device for satellite power systems, thereby increasing the power density of the charging control device and reducing the weight of the satellite power system.

[0004] To achieve the above objectives, this invention provides a high-power-density charging control device for a satellite power system, comprising two charging regulators that serve as backups for each other; each charging regulator includes a charging enable switch, a charging regulation circuit topology, and a charging mode selection switching circuit connected in sequence; the primary bus V BUS The input of the charging enable switch determines whether the charging regulation circuit topology operates by controlling its on / off state; the charging regulation circuit topology is used to regulate the primary bus V BUS The electrical energy is converted to obtain the voltage and current suitable for charging batteries A and B; the charging mode selection switching circuit is connected to batteries A and B; the charging mode selection switching circuit receives the electrical energy from the charging regulation circuit topology, and realizes the charging regulator's charging needs for batteries A and B by controlling the on or off of the charging mode selection switching circuit.

[0005] The aforementioned satellite power system's high-power-density charging control device supports both cold and hot backup operating modes.

[0006] The aforementioned high-power-density charging control device for the satellite power system includes a first-path charging regulator, wherein the charging enable switch is a switching transistor Q5, and the drain of the switching transistor Q5 is connected to the primary bus V. BUSThe connection is as follows: the source of switch Q5 is connected to the input terminal of the charging regulation circuit topology 1; the charging mode selection switching circuit includes isolation diode D1, isolation diode D2, switch Q1, and switch Q2; the source of switch Q1 is connected to the anode of isolation diode D1, and the drain of switch Q1 is connected to the output terminal of the charging regulation circuit topology 1; the cathode of isolation diode D1 is connected to battery A; the source of switch Q2 is connected to the anode of isolation diode D2, and the drain of switch Q2 is connected to the output terminal of the charging regulation circuit topology; the cathode of isolation diode D2 is connected to battery B; the second charging regulator, wherein: the charging enable switch is switch Q6, and the drain of switch Q6 is connected to the primary bus V. BUS The source of switch Q6 is connected to the input terminal of the charging regulation circuit topology 2; the charging mode selection switching circuit includes isolation diode D3, isolation diode D4, switch Q3, and switch Q4; the source of switch Q3 is connected to the anode of isolation diode D3, and the drain of switch Q3 is connected to the output terminal of the charging regulation circuit topology 2; the cathode of isolation diode D3 is connected to battery A; the source of switch Q4 is connected to the anode of isolation diode D4, and the drain of switch Q4 is connected to the output terminal of the charging regulation circuit topology 2; the cathode of isolation diode D4 is connected to battery B.

[0007] The high-power-density charging control device for the aforementioned satellite power system has three possible scenarios when switch Q5 is on and switch Q6 is off: 1) Switch Q1 is on and switch Q2 is off, and the first-path charging regulator charges battery A; 2) Switch Q1 is off and switch Q2 is on, and the first-path charging regulator charges battery B; 3) Switches Q1 and Q2 are both on, and the first-path charging regulator charges both battery A and battery B simultaneously, with the battery with the lower voltage being automatically charged first.

[0008] 5. The high power density charging control device for a satellite power system as described in claim 3, characterized in that, when switch Q5 is off and switch Q6 is on, there are three situations: 1) switch Q3 is on and switch Q4 is off, the second charging regulator charges battery A; 2) switch Q3 is off and switch Q4 is on, the second charging regulator charges battery B; 3) switch Q3 and switch Q4 are on simultaneously, the second charging regulator charges battery A and battery B simultaneously, and the battery with the lower voltage among batteries A and B is automatically charged first.

[0009] The high-power-density charging control device for the aforementioned satellite power system has five possible scenarios when both switch Q5 and switch Q6 are simultaneously on: 1) When switches Q1 and Q4 are on, and switches Q2 and Q3 are off, the first charging regulator charges battery A, and the second charging regulator charges battery B; 2) When switches Q1 and Q4 are off, and switches Q2 and Q3 are on, the first charging regulator charges battery B, and the second charging regulator charges battery A; 3) When switches Q5 and Q6 are off, and switches Q2 and Q3 are on, the first charging regulator charges battery B, and the second charging regulator charges battery A; 4) When switches Q5 and Q6 are on, the second charging regulator charges battery B; 5) When switches Q5 and Q6 are off, the third charging regulator charges battery A; 6) When switches Q5 and Q6 are on, the fourth charging regulator charges battery B; 7) When switches Q5 and Q6 are off, the fifth charging regulator charges battery A; 8) When switches Q5 and Q6 are on, the sixth charging regulator charges battery B; 9) When switches Q5 and Q6 are on, the seventh charging regulator charges battery B; 10) When switches Q5 and Q6 are on, the eighth charging regulator charges battery A; 11) When switches Q5 and Q6 are on, the ninth charging regulator charges battery B; 12) When switches Q5 and Q6 are on, the eleventh charging regulator charges battery A; 13) When switches Q5 and Q6 are on, the eleventh charging regulator charges battery B; 14) When switches Q5 and Q6 are on, the eleventh charging regulator charges battery A; 15) When switches Q5 and Q6 are on, the eleventh charging regulator charges battery B; 16) When switches Q5 and Q6 are on, the eleventh charging regulator charges battery A; 17) When switches Q5 and Q6 are on, the eleventh charging regulator charges battery B; 18) When switches Q5 and Q6 are on, the eleventh charging regulator charges battery A; 19) When switches Q5 and Q6 are When switch Q1 and switch Q3 are on, and switch Q2 and switch Q4 are off, the first and second charging regulators simultaneously charge battery A; 4) When switch Q2 and switch Q4 are on, and switch Q1 and switch Q3 are off, the first and second charging regulators simultaneously charge battery B; 5) When switch Q1, switch Q2, switch Q3, and switch Q4 are on simultaneously, the first and second charging regulators simultaneously charge battery A and battery B.

[0010] In the high power density charging control device of the aforementioned satellite power system, the selection of switching transistors Q5 and Q6 is consistent, as are the selection of isolation diodes D1, D2, D3, and D4, and the selection of switching transistors Q1, Q2, Q3, and Q4. The parameters of the two charging regulation circuit topologies are also consistent.

[0011] In the high power density charging control device of the aforementioned satellite power system, isolation diodes with low forward voltage drop and short reverse recovery time are selected, and switching transistors with low conduction loss and fast switching speed are selected.

[0012] Compared with the prior art, the beneficial technical effects of the present invention are:

[0013] In this invention, the same charging regulator simultaneously meets the charging needs of two sets of batteries in the satellite power system. By controlling different modes through command switches, the charging mode supports two working conditions: time-sharing sequential charging or simultaneous charging of the two sets of batteries. Compared with the traditional satellite power system charging control device that sets main and backup charging regulators for the two sets of batteries respectively, the power density of the high power density charging control device of this invention is doubled. Attached Figure Description

[0014] The high power density charging control device for satellite power systems of the present invention is given by the following embodiments and figures.

[0015] Figure 1 This is a schematic diagram of a high-power-density charging control device for a satellite power system according to an embodiment of the present invention. Detailed Implementation

[0016] The following will combine Figure 1 The high power density charging control device for satellite power systems of the present invention will be described in further detail.

[0017] The high power density charging control device for satellite power systems of the present invention includes two charging regulators, which are backups of each other and support both cold and hot backup operating modes. Each charging regulator includes a charging enable switch, a charging regulation circuit topology, and a charging mode selection switching circuit connected in sequence.

[0018] Primary bus V BUS The charging enable switch is input as the input to the high power density charging control device of the satellite power system; by controlling the opening and closing of the charging enable switch, it is determined whether the charging regulation circuit topology works. Specifically, when the charging enable switch is on, the charging regulation circuit topology works, and when the charging enable switch is off, the charging regulation circuit topology does not work.

[0019] The charging regulation circuit topology is used to regulate the primary bus V. BUS The electrical energy is converted to obtain the voltage and current suitable for charging batteries A and B;

[0020] The charging mode selection switching circuit is connected to battery A and battery B; the charging mode selection switching circuit receives electrical energy from the charging regulation circuit topology, and realizes the charging regulator's charging needs for battery A and battery B by controlling the switching circuit to be turned on or off.

[0021] Example:

[0022] Figure 1 The diagram shown is a schematic diagram of a high-power-density charging control device for a satellite power system according to an embodiment of the present invention.

[0023] See Figure 1 The high power density charging control device of the satellite power system in this embodiment includes two charging regulators. The two charging regulators have the same structure and are backups of each other, supporting both cold and hot backup working modes.

[0024] Each charging regulator includes a charging enable switch, a charging regulation circuit topology, and a charging mode selection switching circuit connected in sequence. By controlling the opening and closing of the charging enable switch, it determines which charging regulation circuit topology works, that is, which charging regulator works.

[0025] Specifically, the first charging regulator includes:

[0026] The charging enable switch uses transistor Q5, and the drain of transistor Q5 is connected to the primary bus V.BUS The source of the switching transistor Q5 is connected to the input terminal of the charging regulation circuit topology 1.

[0027] The charging mode selection switching circuit includes isolation diodes D1 and D2, switching transistors Q1 and Q2; the source of switching transistor Q1 is connected to the anode of isolation diode D1, and the drain of switching transistor Q1 is connected to the output terminal of the charging regulation circuit topology 1; the cathode of isolation diode D1 is connected to battery A; the source of switching transistor Q2 is connected to the anode of isolation diode D2, and the drain of switching transistor Q2 is connected to the output terminal of the charging regulation circuit topology; the cathode of isolation diode D2 is connected to battery B.

[0028] The second charging regulator includes:

[0029] The charging enable switch is a switching transistor Q6, and the drain of the switching transistor Q6 is connected to the primary bus V. BUS The source of the switching transistor Q6 is connected to the input terminal of the charging regulation circuit topology 2.

[0030] The charging mode selection switching circuit includes isolation diodes D3 and D4, switching transistors Q3 and Q4; the source of switching transistor Q3 is connected to the anode of isolation diode D3, and the drain of switching transistor Q3 is connected to the output terminal of the charging regulation circuit topology 2; the cathode of isolation diode D3 is connected to battery A; the source of switching transistor Q4 is connected to the anode of isolation diode D4, and the drain of switching transistor Q4 is connected to the output terminal of the charging regulation circuit topology 2; the cathode of isolation diode D4 is connected to battery B.

[0031] The charging regulation circuit topology in the charging regulator can adopt the charging regulation circuit topology of existing technology.

[0032] When switch Q5 is on and switch Q6 is off, there are three scenarios: 1) Switch Q1 is on and switch Q2 is off, the first charging regulator charges battery A; 2) Switch Q1 is off and switch Q2 is on, the first charging regulator charges battery B; 3) Switches Q1 and Q2 are on simultaneously, the first charging regulator charges both battery A and battery B simultaneously, with the battery with the lower voltage being charged first.

[0033] When switch Q5 is off and switch Q6 is on, there are three scenarios: 1) Switch Q3 is on and switch Q4 is off, the second charging regulator charges battery A; 2) Switch Q3 is off and switch Q4 is on, the second charging regulator charges battery B; 3) Switches Q3 and Q4 are on simultaneously, the second charging regulator charges both battery A and battery B simultaneously, with the battery with the lower voltage being charged automatically first.

[0034] When both switching transistors Q5 and Q6 are turned on, batteries A and / or B can be charged simultaneously through two charging regulators. There are five scenarios: 1) When switching transistors Q1 and Q4 are on, and switching transistors Q2 and Q3 are off, the first charging regulator charges battery A, and the second charging regulator charges battery B; 2) When switching transistors Q1 and Q4 are off, and switching transistors Q2 and Q3 are on, the first charging regulator charges battery B, and the second charging regulator charges battery A. 3) When switches Q1 and Q3 are on and switches Q2 and Q4 are off, the first and second charging regulators simultaneously charge battery A. 4) When switches Q2 and Q4 are on and switches Q1 and Q3 are off, the first and second charging regulators simultaneously charge battery B. 5) When switches Q1, Q2, Q3, and Q4 are on simultaneously, the first and second charging regulators simultaneously charge battery A and battery B.

[0035] Switch Q1 and switch Q3 serve as backups for each other. If switch Q1 fails, switch Q3 can be turned on to charge battery A. Switch Q2 and switch Q4 serve as backups for each other. If switch Q2 fails, switch Q4 can be turned on to charge battery B, and the circuit operation will not be affected.

[0036] To prevent circulating current between circuits or backflow of battery current into the charging regulation circuit topology, which could damage the charging regulation circuit topology, this invention connects an isolation diode in series between the switching transistor and the battery to prevent backflow of current and affect circuit operation.

[0037] Preferably, to ensure high reliability of the circuit, the selection of switching transistors Q5 and Q6 should be consistent, the selection of isolation diodes D1, D2, D3 and D4 should be consistent, the selection of switching transistors Q1, Q2, Q3 and Q4 should be consistent, and the voltage conversion ratio and other parameters of the two charging regulation circuit topologies should be consistent.

[0038] Preferably, in order to reduce the losses of the switching transistor and the isolation diode, when selecting components, isolation diodes with low forward voltage drop and short reverse recovery time should be selected, and switching transistors with low conduction loss and fast switching speed should be selected.

[0039] Compared with the traditional satellite power system charging control device that sets up main and backup charging regulators for two sets of batteries respectively, the power density of the satellite power system high power density charging control device of the present invention is doubled; the number of charging regulators is reduced from 4 to 2, which is in line with the development trend of lightweight satellite power systems.

[0040] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A high power density charge control device for a satellite power system, characterized by, The application relates to a dual-channel charging regulator, which comprises two charging regulators in a backup relationship; the charging regulator comprises a charging enable switch, a charging regulation circuit topology and a charging mode selection switching circuit connected in sequence; Primary bus V BUS The charging enable switch is inputted, and whether the charging regulation circuit topology works is determined by controlling the turn-on and turn-off of the charging enable switch. The charging regulation circuit topology is used to transform the electric energy of the primary bus V BUS to obtain the voltage and current suitable for charging the battery A and the battery B. The charging mode selection switching circuit is connected with the storage battery A and the storage battery B; the charging mode selection switching circuit receives the electric energy of the charging regulation circuit topology, and the charging demand of the charging regulator for the storage battery A and the storage battery B is realized by controlling the turn-on or turn-off of the charging mode selection switching circuit.

2. The satellite power system high power density charge control device of claim 1, wherein, The application supports two working modes of cold backup and hot backup.

3. The high power density charge control device for a satellite power system of claim 1, wherein, The first charging regulator comprises a charging enable switch, a charging regulation circuit topology and a charging mode selection switching circuit connected in sequence. The charging enabling switch adopts a switch tube Q5, the drain electrode of the switch tube Q5 is connected with the primary bus V BUS The source electrode of the switch tube Q5 is connected with the input end of the charging regulation circuit topology 1. The charging mode selection switching circuit comprises an isolation diode D1, an isolation diode D2, a switch tube Q1 and a switch tube Q2; the source electrode of the switch tube Q1 is connected with the anode of the isolation diode D1, the drain electrode of the switch tube Q1 is connected with the output end of the charging regulation circuit topology 1; the cathode of the isolation diode D1 is connected with the storage battery A; the source electrode of the switch tube Q2 is connected with the anode of the isolation diode D2, the drain electrode of the switch tube Q2 is connected with the output end of the charging regulation circuit topology; the cathode of the isolation diode D2 is connected with the storage battery B. The second charging regulator comprises a charging enable switch, a charging regulation circuit topology and a charging mode selection switching circuit connected in sequence. The charging enabling switch adopts a switch tube Q6, the drain electrode of the switch tube Q6 is connected with the primary bus V BUS The source electrode of the switch tube Q6 is connected with the input end of the charging regulation circuit topology 2. The charging mode selection switching circuit comprises an isolation diode D3, an isolation diode D4, a switch tube Q3 and a switch tube Q4; the source electrode of the switch tube Q3 is connected with the anode of the isolation diode D3, the drain electrode of the switch tube Q3 is connected with the output end of the charging regulation circuit topology 2; the cathode of the isolation diode D3 is connected with the storage battery A; the source electrode of the switch tube Q4 is connected with the anode of the isolation diode D4, the drain electrode of the switch tube Q4 is connected with the output end of the charging regulation circuit topology 2; the cathode of the isolation diode D4 is connected with the storage battery B.

4. The high power density charge control device for a satellite power system of claim 3, wherein, When the switch tube Q5 is turned on and the switch tube Q6 is turned off, there are three situations: 1) the switch tube Q1 is turned on and the switch tube Q2 is turned off, the first charging regulator charges the storage battery A; 2) the switch tube Q1 is turned off and the switch tube Q2 is turned on, the first charging regulator charges the storage battery B; 3) the switch tube Q1 and the switch tube Q2 are simultaneously turned on, the first charging regulator charges the storage battery A and the storage battery B simultaneously, and the storage battery A and the storage battery B with the lower voltage are automatically preferentially charged.

5. The high power density charge control device for a satellite power system of claim 3, wherein, When the switch tube Q5 is turned off and the switch tube Q6 is turned on, there are three situations: 1) the switch tube Q3 is turned on and the switch tube Q4 is turned off, the second charging regulator charges the storage battery A; 2) the switch tube Q3 is turned off and the switch tube Q4 is turned on, the second charging regulator charges the storage battery B; 3) the switch tube Q3 and the switch tube Q4 are simultaneously turned on, the second charging regulator charges the storage battery A and the storage battery B simultaneously, and the storage battery A and the storage battery B with the lower voltage are automatically preferentially charged.

6. The high power density charge control device for a satellite power system of claim 3, wherein, When the switch Q5 and the switch Q6 are turned on at the same time, there are five cases: 1) the switch Q1 and the switch Q4 are turned on, and the switch Q2 and the switch Q3 are turned off, the first charging regulator charges the battery A, and the second charging regulator charges the battery B; 2) the switch Q1 and the switch Q4 are turned off, and the switch Q2 and the switch Q3 are turned on, the first charging regulator charges the battery B, and the second charging regulator charges the battery A; 3) the switch Q1 and the switch Q3 are turned on, and the switch Q2 and the switch Q4 are turned off, the first charging regulator and the second charging regulator charge the battery A at the same time; 4) the switch Q2 and the switch Q4 are turned on, and the switch Q1 and the switch Q3 are turned off, the first charging regulator and the second charging regulator charge the battery B at the same time; 5) the switch Q1, the switch Q2, the switch Q3 and the switch Q4 are turned on at the same time, the first charging regulator and the second charging regulator charge the battery A and the battery B at the same time.

7. The high power density charging control device of the satellite power system of claim 3, wherein, When selecting components, the switch Q5 and the switch Q6 are selected to be the same, the isolation diode D1, the isolation diode D2, the isolation diode D3 and the isolation diode D4 are selected to be the same, the switch Q1, the switch Q2, the switch Q3 and the switch Q4 are selected to be the same, and the parameters of the two charging regulator circuit topologies are the same.

8. The high power density charging control device of the satellite power system of claim 3, wherein, When selecting components, the isolation diode with small forward conduction voltage drop and short reverse recovery time is selected, and the switch with small conduction loss and fast switching speed is selected.

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