CN109274259B - Power supply on-off control method, device and application - Google Patents

Abstract

The invention provides a power supply on-off control method, a power supply on-off control device and application, and belongs to the technical field of space power supplies. The control method comprises the following steps: sending a control signal through a programmable time sequence control circuit, wherein the control signal comprises a high-level starting signal or a low-level shutdown signal; when the control signal is a high-level starting signal, the switch module is conducted, so that the control module is switched to the output enabling end of the DC/DC module and is kept constantly, and the DC/DC module outputs secondary voltage; and when the control signal is a low-level shutdown signal, the switch module is not conducted, so that the control module is switched to the forbidden output end of the DC/DC module and is kept constantly, and the DC/DC module does not output voltage. The invention has the advantages of few peripheral devices, high reliability and high control time precision, and is very suitable for the current requirements of miniaturization, low power consumption and light weight of space missions. The problem of the control of the sequential startup and shutdown of a plurality of satellite platforms under the condition that the control signal is low voltage is solved.

Description

A power switch control method, device and application

technical field

The invention provides a power switch control method, device and application, belonging to the technical field of space power supply.

Background technique

The target of deep space exploration is far away from the earth. The energy and power problem of long-term flight is a worldwide technical problem, and the energy after the Mars rover landed is even more limited. Therefore, it is particularly important to control the on-board equipment reasonably according to the actual needs. , which directly determines the working life of the detector.

The existing on-off control methods of the on-board power supply are relatively simple in implementation principle. The voltage range of the on-off control circuit is generally 10-12V or 28V, and the circuit is realized in the form of a relay or an optocoupler. The control of the on-off control requires two Signal. For example, Document 1 "Control Method of Space Power Module with Switching Sequence Requirements" (Wang An, Wu Rong, Space Electronics Technology, 2017) is designed for the on-board CCD camera's step-by-step power-on and power-off timing control requirements. A sequential logic control circuit is proposed, and theoretical analysis and calculation are carried out, and experimental verification is carried out at the same time; Document 2 "A Novel DC-DC Converter Step-by-Step Power-Off Control Circuit" (Wang Weiguo, Liu Kecheng, Electronic Design Application, 2009) The article proposes a design method using MOSFET + operational amplifier + RC delay network for the step-by-step power-on and power-off sequence requirements of space vehicles, and gives the simulation data.

In Literature 1, the on-off control method is mainly composed of analog circuits such as operational amplifier + RC delay network + magnetic latching relay, and the on-off time interval is mainly adjusted by the RC delay network; affected by the circuit form, the on-off sequence can only be It reaches the millisecond level, and the control time and error are affected by the action time of the magnetic latching relay, and the accuracy of the switching sequence is not high; Literature 2 mainly connects N-channel MOSFET transistors in series at the input end (return line) of the DC/DC module. Instead of the relay, the power-on and power-off control of the DC/DC module is realized by controlling the on-off of the MOSFET tube. The main circuit is composed of analog circuits such as MOSFET tube + operational amplifier + RC delay network. There is the same problem, that is, the power-on and power-off time is controlled by the operational amplifier and the RC network, and the step-by-step power-on and power-off sequence adjustment is limited and the accuracy is not high.

SUMMARY OF THE INVENTION

In order to overcome the deficiencies in the prior art, the present invention provides a power switch control method, device and application. The control time of the method can be set by software programming, so the time interval and precision are controllable. At the same time, the method uses fewer devices, which is very suitable for the requirements of high integration, miniaturization and low power consumption of deep space exploration.

The technical solution adopted by the present invention is:

A power switch control method, comprising:

Sending a control signal through a programmable timing control circuit, the control signal includes a high-level power-on signal or a low-level power-off signal;

When the control signal is a high-level power-on signal, the switch module is turned on, so that the control module switches to the output enable terminal of the DC/DC module and keeps it, so that the DC/DC module outputs the secondary voltage;

When the control signal is a low-level shutdown signal, the switch module is not turned on, so that the control module switches to the prohibited output end of the DC/DC module and keeps it all the time, so that the DC/DC module No voltage is output.

In an optional embodiment, the switch module includes a filter circuit and a transistor switch circuit, the filter circuit is used to filter out interference and noise on the control signal output by the programmable timing control circuit, and the transistor switch circuit It is used to realize conduction or non-conduction according to the high and low levels of the control signal output by the filter circuit.

In an optional embodiment, the filter circuit includes capacitors C1, C2, C3, and C4. The capacitors C1 and C2 are connected in series, and connected in parallel with the capacitors C3 and C4. One end of the capacitor C1 is connected to the capacitor C1. The output end of the programmable timing control circuit is connected, and the other end of the capacitor C2 is grounded; the transistor switch circuit includes a transistor Q1, a resistor R1, and a resistor R2, and one end of the resistor R1 is connected to the output of the filter circuit The other end is connected to the base of the transistor Q1, one end of the resistor R2 is connected to the base of the transistor Q1, the other end is connected to the ground, the emitter of the transistor Q1 is connected to the ground, and the collector of the transistor Q1 is connected to the ground the input of the control module.

In an optional embodiment, the control module includes an electromagnetic relay U1, diodes V1 and V2, and resistors R3 and R4. The two sets of contacts of the electromagnetic relay U1 are connected in parallel. The terminal is connected to the power input end, and the second terminal of the resistors R3 and R4 in parallel is connected to one end of the wire package of the electromagnetic relay U1. The INHIBIT enable terminal of the DC/DC module, the negative terminal of the diode V1 is connected to the second terminal of the resistors R3 and R4 in parallel, the positive terminal of the diode V1 is connected to the negative terminal of the diode V2, so the The positive end of the diode V2 is connected to the other end of the wire package of the electromagnetic relay U1.

A power switch control device, comprising:

a programmable timing control circuit for sending a control signal, the control signal including a high-level power-on signal or a low-level power-off signal;

a switch module, configured to conduct when the control signal is a high-level power-on signal, and not conduct when the control signal is a low-level shutdown signal;

The control module is used to switch to the output enable terminal of the DC/DC module when the switch module is turned on and keep it, and when the switch module is not turned on, switch to the output enable terminal of the DC/DC module end and maintain;

The DC/DC module is used for outputting the secondary voltage when the control module switches to the output enable terminal of the DC/DC module and keeps it, and when the control module switches to the prohibit output terminal of the DC/DC module and keeps it No voltage is output when it is held all the time.

In an optional embodiment, the switch module includes a filter circuit and a transistor switch circuit, the filter circuit is used to filter out interference and noise on the control signal output by the programmable timing control circuit, and the transistor switch circuit It is used to realize conduction or non-conduction according to the high and low levels of the control signal after passing through the filter circuit.

In an optional embodiment, the filter circuit includes capacitors C1, C2, C3, and C4. The capacitors C1 and C2 are connected in series, and connected in parallel with the capacitors C3 and C4. One end of the capacitor C1 is connected to the capacitor C1. The output end of the programmable timing control circuit is connected, and the other end of the capacitor C2 is grounded; the transistor switch circuit includes a transistor Q1, a resistor R1, and a resistor R2, and one end of the resistor R1 is connected to the output end of the filter circuit , the other end is connected to the base of the transistor Q1, one end of the resistor R2 is connected to the base of the transistor Q1, the other end is grounded, the emitter of the transistor Q1 is grounded, and the collector of the transistor Q1 is connected to the The input terminal of the control module.

In an optional embodiment, the control module is an electromagnetic relay control module.

In an optional embodiment, the electromagnetic relay module includes an electromagnetic relay U1, diodes V1 and V2, and resistors R3 and R4. The two sets of contacts of the electromagnetic relay U1 are connected in parallel, and the third connection after the resistors R3 and R4 are connected in parallel. One end is connected to the power input end, the second end of the resistors R3 and R4 connected in parallel is connected to one end of the wire package of the electromagnetic relay U1, one end of the two groups of contacts of the electromagnetic relay U1 connected in parallel is connected to the ground once, and the other end is connected to the ground. Connect to the INHIBIT enable terminal of the DC/DC module, the negative terminal of the diode V1 is connected to the second terminal of the resistors R3 and R4 in parallel, the positive terminal of the diode V1 is connected to the negative terminal of the diode V2, The positive end of the diode V2 is connected to the other end of the wire package of the electromagnetic relay U1.

The application of the above-mentioned power switch control device in the space-borne power supply.

Compared with the prior art, the present invention has the following advantages:

(1) The power switch control device provided by the embodiment of the present invention uses a programmable sequence control circuit to send a control signal, and the voltage amplitude of the control signal is only 3.3V, which meets the requirements of low voltage and low power consumption of the digital processing system on the satellite. need;

(2) Under the situation that the resources on the satellite are quite limited, the present invention only uses a low voltage signal to control the switch machine, the control logic is simple, and basically does not occupy the system software resources;

(3) Since the control signal is output by the programmable sequence control circuit, the control time interval can be arbitrarily changed according to the software program, and the time accuracy is high, which reduces the complexity of the switch design and improves the reliability;

(4) Compared with the traditional analog circuit implementation, the anti-interference capability of the present invention is greatly increased.

Description of drawings

1 is a schematic diagram of a power switch control device according to an embodiment of the present invention;

2 is a schematic diagram of an on-board power switch control device provided by a specific embodiment of the present invention;

FIG. 3 is a flowchart of a method for controlling a power switch according to an embodiment of the present invention.

Detailed ways

The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

Referring to FIG. 1, an embodiment of the present invention provides a power switch control device, including:

a programmable timing control circuit for sending a control signal, the control signal including a high-level power-on signal or a low-level power-off signal;

a switch module, configured to conduct when the control signal is a high-level power-on signal, and not conduct when the control signal is a low-level shutdown signal;

The control module is used to switch to the output enable terminal of the DC/DC module when the switch module is turned on and keep it, and when the switch module is not turned on, the block switches to the prohibition of the DC/DC module output and keep it;

The DC/DC module is used for outputting the secondary voltage when the control module switches to the output enable terminal of the DC/DC module and keeps it, and when the control module switches to the prohibit output terminal of the DC/DC module and keeps it No voltage is output when it is held all the time.

Specifically, in the embodiment of the present invention, the programmable timing control circuit may be a digital logic programmable circuit such as an FPGA timing control circuit, a single-chip timing control circuit, etc., which is not limited in the present invention; the switch module is preferably a transistor switch module to improve the response speed ; The control module is preferably an electromagnetic relay control module.

The embodiments of the present invention can be applied to on-off control of on-board power supplies.

The power switch control device provided by the embodiment of the present invention transmits a control signal by using a programmable sequence control circuit, and the voltage amplitude of the control signal is only 3.3V, which meets the requirements of low voltage and low power consumption of the digital processing system on the satellite; When the resources on the satellite are quite limited, the present invention only uses a low-voltage signal to control the switch, the control logic is simple, and basically does not occupy the system software resources; since the control signal is output by the programmable sequence control circuit, the control time interval can be adjusted. It can be changed arbitrarily according to the software program, and the time accuracy is high, which reduces the complexity of the switch design and improves the reliability; compared with the traditional analog circuit implementation, the anti-interference capability of the present invention is greatly improved.

Referring to FIG. 2, in an optional embodiment, the switch module includes a filter circuit and a transistor switch circuit, and the filter circuit is used to filter out interference and noise on the control signal output by the programmable timing control circuit, so The transistor switch circuit is used to realize conduction or non-conduction according to the high and low levels of the control signal after passing through the filter circuit. The filter circuit includes capacitors C1, C2, C3, and C4. The capacitors C1 and C2 are connected in series, and after being connected in series, they are connected in parallel with the capacitors C3 and C4. One end of the capacitor C1 is output from the programmable timing control circuit. The other end of the capacitor C2 is connected to the ground; the transistor switch circuit includes a transistor Q1, a resistor R1, and a resistor R2, one end of the resistor R1 is connected to the output end of the filter circuit, and the other end is connected to the transistor Q1 The base of the resistor R2, one end of the resistor R2 is connected to the base of the transistor Q1, the other end is grounded, the emitter of the transistor Q1 is grounded, and the collector of the transistor Q1 is connected to the input end of the control module. The invention makes full use of the advantages of transistors as switches, which have the advantages of sensitive response, fast switching speed and high stability. At the same time, since the electromagnetic relay driven by the back end is an inductive device, no spark will be generated at the moment when the switch is turned on, which greatly improves the aerospace industry. Product safety and reliability. Referring to FIG. 2, in an optional embodiment, the electromagnetic relay module includes an electromagnetic relay U1, diodes V1, V2, resistors R3, R4, two sets of contacts of the electromagnetic relay U1 are connected in parallel, and the resistors R3, R4 The first terminal after parallel connection is connected to the power input terminal, the second terminal after the parallel connection of the resistors R3 and R4 is connected to one end of the wire package of the electromagnetic relay U1, and the parallel connection of the two groups of contacts of the electromagnetic relay U1 is connected once. The other end is connected to the INHIBIT enable end of the DC/DC module, the negative end of the diode V1 is connected to the second end of the resistors R3 and R4 in parallel, and the positive end of the diode V1 is connected to the diode V2 The negative end of the diode V2 is connected to the other end of the wire package of the electromagnetic relay U1. The present invention switches the state by using the electromagnetic relay, the circuit realization mode is simple, the switching is reliable, and the universal design is strong. At the same time, combined with the miniaturization and low power consumption requirements of deep space exploration, the selected electromagnetic relay has the advantages of small size, light weight, good shock resistance, high sensitivity, and fast action, which meets the requirements of aerospace tasks and has high engineering application value.

Referring to FIG. 3, an embodiment of the present invention provides a power switch control method, including:

Step 101: Send a control signal through a programmable timing control circuit, where the control signal includes a high-level power-on signal or a low-level power-off signal;

Step 102: When the control signal is a high-level power-on signal, the switch module is turned on, so that the control module switches to the output enable terminal of the DC/DC module and keeps it there, so that the DC/DC module outputs a secondary output voltage; when the control signal is a low-level shutdown signal, the switch module is not turned on, so that the control module switches to the prohibited output end of the DC/DC module and keeps it all the time, so that the DC/DC The DC module does not output voltage.

The control methods provided in the embodiments of the present invention correspond to the foregoing apparatus embodiments one by one. For specific descriptions and effects, refer to the foregoing apparatus embodiments, which will not be repeated here.

In the power switch control method provided by the embodiment of the present invention, by using a programmable sequence control circuit to send a control signal, the voltage amplitude of the control signal is only 3.3V, which meets the requirements of low voltage and low power consumption of the digital processing system on the satellite; When the resources on the satellite are quite limited, the present invention only uses a low-voltage signal to control the switch, the control logic is simple, and basically does not occupy the system software resources; since the control signal is output by the programmable sequence control circuit, the control time interval can be adjusted. It can be changed arbitrarily according to the software program, and the time accuracy is high, which reduces the complexity of the switch design and improves the reliability; compared with the traditional analog circuit implementation, the anti-interference capability of the present invention is greatly improved.

The following is a specific embodiment of the present invention:

As shown in FIG. 2 , an embodiment of the present invention provides a low-voltage input on-board power switch control device, including an FPGA timing control circuit, a transistor switch module, an electromagnetic relay control module, a DC/DC module, and onboard equipment;

The transistor switch module includes a filter circuit and a transistor switch circuit. The filter circuit includes capacitors C1, C2, C3, and C4. The capacitors C1 and C2 are connected in series and connected in parallel with the capacitors C3 and C4. One end of the capacitor C1 is connected to the output end of the programmable timing control circuit, and the other end of the capacitor C2 is grounded; the transistor switch circuit includes a transistor Q1, a resistor R1, and a resistor R2, and one end of the resistor R1 is connected to a logic signal Input, the other end is connected to the base of the transistor Q1, one end of the resistor R2 is connected to the base of the transistor Q1, the other end is grounded, the emitter of the transistor Q1 is grounded, and the collector of the transistor Q1 is connected to the ground The input terminal of the control module;

The electromagnetic relay control module includes an electromagnetic relay U1, diodes V1, V2, resistors R3, R4, two sets of contacts of the electromagnetic relay U1 are connected in parallel, and the first terminal after the parallel connection of the resistors R3 and R4 is connected to the power input terminal, The second end of the parallel connection of the resistors R3 and R4 is connected to one end of the wire package of the electromagnetic relay U1. One end of the two groups of contacts of the electromagnetic relay U1 connected in parallel is connected to ground once, and the other end is connected to the DC/DC module. The INHIBIT enable terminal of the diode V1, the negative terminal of the diode V1 is connected to the second terminal of the resistors R3 and R4 in parallel, the positive terminal of the diode V1 is connected to the negative terminal of the diode V2, and the positive terminal of the diode V2 Connect to the other end of the electromagnetic relay U1 wire package.

1) The enabling terminal of the DC/DC module that supplies power to the space-borne high-power equipment (or equipment that does not need to be powered on first) when it is not powered on is pulled by the electromagnetic relay control module to the output-prohibited state;

2) When the high-power equipment needs to be turned on according to the requirements of the aerospace mission, the FPGA timing control circuit outputs a low-voltage signal 3.3V (logic high level) power-on signal;

3) The 3.3V high level enters the transistor switch circuit after passing through the matched filter circuit;

4) After the transistor Q1 is turned on as a switch, a voltage difference is generated between the two ends of the wire package of the electromagnetic relay U1, so that the electromagnetic relay U1 operates.

5) After the electromagnetic relay U1 operates, the contact switches to the output enable terminal of the DC/DC module and keeps it constant, the output terminal of the DC/DC module outputs the secondary voltage normally, and the high-power equipment is turned on at this time.

6) When the high-power equipment needs to be shut down, the FPGA sequence control circuit outputs a logic low level of 0V.

7) The 0V voltage enters the base of the transistor Q1, and the transistor Q1 is not turned on as a switch at this time.

8) The contact of the electromagnetic relay U1 is switched to the prohibited output end of the DC/DC module and keeps it all the time. At this time, the DC/DC module does not output voltage, and the high-power equipment is turned off.

Table 1 Model specifications of the components used in this embodiment

Among them, the FPGA is the Virtex4-SX55 chip of XILINX, which is widely used on the satellite; the DC/DC module is a common thick-film process module that meets the aerospace requirements.

The present invention is a brand-new design method based on the actual needs of deep space exploration in my country. The method controls the timing sequence through digital logic circuits, and uses the switching characteristics of transistors to control the contacts of electromagnetic relays, and then control DC/DC. The enable pin of the module to control the switch of related equipment. This method does not use optocouplers, reducing the risk of space irradiation. The signal level of the control terminal is in the form of LVTTL. The circuit has few peripheral devices, high reliability, and high control time precision, and is very suitable for the current task requirements of miniaturization, low power consumption, and light weight.

Another advantage of the present invention is that compared with the traditional control method, the present invention only uses one signal to control the power on and off, and because the control logic is simple, it basically does not occupy system software resources.

The above is only the best specific embodiment of the present invention, but the protection scope of the present invention is not limited to this. Substitutions should be covered within the protection scope of the present invention.

The parts not described in detail in the present invention belong to the common knowledge of those skilled in the art.

Claims (7)

1. A power on/off control method is characterized by comprising the following steps:

sending a control signal through a programmable time sequence control circuit, wherein the control signal comprises a high-level starting signal or a low-level shutdown signal;

when the control signal is a high-level starting signal, the switch module is conducted, so that the control module is switched to the output enabling end of the DC/DC module and is kept constantly, and the DC/DC module outputs secondary voltage;

when the control signal is a low-level shutdown signal, the switch module is not conducted, the control module is switched to the forbidden output end of the DC/DC module and is kept constantly, and therefore the DC/DC module does not output voltage;

the control module comprises an electromagnetic relay U1, diodes V1, V2, resistors R3 and R4, two sets of contacts of the electromagnetic relay U1 are connected in parallel, the first end of the resistors R3 and R4 after being connected in parallel is connected with a power input end, the second end of the resistors R3 and R4 after being connected in parallel is connected with one end of a solenoid of the electromagnetic relay U1, one end of the two sets of contacts of the electromagnetic relay U1 after being connected in parallel is connected with a ground, the other end of the two sets of contacts is connected with an INHIBIT enabling end of the DC/DC module, the negative end of the diode V1 is connected with the second end of the resistors R3 and R4 after being connected in parallel, the positive end of the diode V1 is connected with the negative end of the diode V2, and the positive end of the diode V2 is connected with the other end of.

2. The power on/off control method according to claim 1, wherein the switch module includes a filter circuit and a transistor switch circuit, the filter circuit is configured to filter interference and noise on the control signal output by the programmable timing control circuit, and the transistor switch circuit is configured to be turned on or off according to a high or low level of the control signal output by the filter circuit.

3. The power on/off control method of claim 2, wherein the filter circuit comprises capacitors C1, C2, C3 and C4, the capacitors C1 and C2 are connected in series and then connected in parallel with the capacitors C3 and C4, one end of the capacitor C1 is connected to the output end of the programmable timing control circuit, and the other end of the capacitor C2 is grounded; the transistor switch circuit comprises a transistor Q1, a resistor R1 and a resistor R2, wherein one end of the resistor R1 is connected with the output end of the filter circuit, the other end of the resistor R1 is connected with the base electrode of the transistor Q1, one end of the resistor R2 is connected with the base electrode of the transistor Q1, the other end of the resistor R2 is grounded, the emitter electrode of the transistor Q1 is grounded, and the collector electrode of the transistor Q1 is connected with the input end of the control module.

4. A power switch control apparatus, comprising:

the programmable time sequence control circuit is used for sending control signals, and the control signals comprise high-level startup signals or low-level shutdown signals;

the switch module is used for conducting when the control signal is a high-level starting signal and not conducting when the control signal is a low-level shutdown signal;

the control module is used for switching to an output enabling end of the DC/DC module and keeping the output enabling end when the switch module is conducted, and switching to a forbidden output end of the DC/DC module and keeping the output forbidden output end when the switch module is not conducted; the control module is an electromagnetic relay control module; the electromagnetic relay module comprises an electromagnetic relay U1, diodes V1, V2 and resistors R3 and R4, two groups of contacts of the electromagnetic relay U1 are connected in parallel, the first end of the resistors R3 and R4 after being connected in parallel is connected with the input end of a power supply, the second end of the resistors R3 and R4 after being connected in parallel is connected with one end of a coil of the electromagnetic relay U1, one end of the two groups of contacts of the electromagnetic relay U1 after being connected in parallel is connected with the ground once, the other end of the two groups of contacts is connected with the INHIBIT enabling end of the DC/DC module, the negative end of the diode V1 is connected with the second end of the resistors R3 and R4 after being connected in parallel, the positive end of the diode V1 is connected with the negative end of the diode V2, and the positive end of the diode V2 is connected with;

the DC/DC module is used for outputting secondary voltage when the control module is switched to an output enabling end of the DC/DC module and keeps the secondary voltage all the time, and does not output voltage when the control module is switched to a forbidden output end of the DC/DC module and keeps the secondary voltage all the time.

5. The power switch control device according to claim 4, wherein the switch module comprises a filter circuit and a transistor switch circuit, the filter circuit is configured to filter interference and noise on the control signal output by the programmable timing control circuit, and the transistor switch circuit is configured to be turned on or off according to the high and low levels of the control signal after passing through the filter circuit.

6. A power switch control device according to claim 5, characterized in that said filter circuit comprises capacitors C1, C2, C3 and C4, said capacitors C1 and C2 are connected in series and then connected in parallel with said capacitors C3 and C4, one end of said capacitor C1 is connected with said programmable timing control circuit output end, and the other end of said capacitor C2 is grounded; the transistor switch circuit comprises a transistor Q1, a resistor R1 and a resistor R2, wherein one end of the resistor R1 is connected with the output end of the filter circuit, the other end of the resistor R1 is connected with the base electrode of the transistor Q1, one end of the resistor R2 is connected with the base electrode of the transistor Q1, the other end of the resistor R2 is grounded, the emitter electrode of the transistor Q1 is grounded, and the collector electrode of the transistor Q1 is connected with the input end of the control module.

7. A power switch control device according to any of claims 4 to 6, characterised in that it is applied to a satellite borne power supply.

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