Variable three-state output voltage control circuit of power supply module and implementation method of variable three-state output voltage control circuit

Abstract

The invention relates to a power supply module variable three-state output voltage control circuit and an implementation method thereof. The circuit comprises a gating circuit unit, a voltage stabilizing circuit unit, an isolation transmission circuit unit, a variable three-state conversion circuit unit and a power supply module. The control signal is connected with the gating circuit unit; the output end of the gating circuit unit is connected with the input end of the isolation transmission circuit unit; the input voltage of the power supply module serves as the input end of the voltage stabilizing circuit unit, and the output end of the voltage stabilizing circuit unit is connected with the input end of the isolation transmission circuit unit. The output end of the isolation transmission circuit unit is connected with the input end of the variable three-state conversion circuit unit; and the output end of the variable three-state conversion circuit unit is connected with the power supply module, so that three variable state outputs of input and output isolation of the power supply module are realized. According to the variable power demand of the system for the power supply, three different state voltage outputs of the power supply module are accurately controlled, and better adaptability and stability are provided.

Description

Technical Field

[0001] The present invention relates to the technical field of aerospace power supply, and in particular to a variable three-state output voltage control circuit of a power supply module and a realization method thereof. Background Art

[0002] Aerospace power systems are key components to ensure the normal operation of aircraft and are responsible for providing stable and reliable power to aerospace equipment. With the rapid development of aerospace technology, the number of payloads has also increased significantly, but the power requirements of different payloads are also different.

[0003] In order to effectively solve the complex power requirements of different loads, many research institutions at home and abroad are competing to carry out control technology research related to controllable output voltage to replace the traditional multi-power supply scheme. In terms of coping with the complex power requirements of different loads in aerospace, although the controllable output voltage control technology has shown significant advantages, there are still some technical deficiencies and challenges. The payloads on spacecraft range from low-power sensors to high-power communication equipment, and their operating currents can vary from microamperes to tens of amperes. This places extremely high demands on the dynamic response capability and voltage regulation accuracy of the power supply system. Some devices, such as motors or high-power RF amplifiers, will generate large transient currents at startup, which may cause voltage sags or overshoots, affecting the normal operation of other sensitive devices. Different types of electronic components may require different levels of DC voltage (such as 3.3V, 5V, 12V, etc.), which requires the power supply system to flexibly provide multiple voltage outputs.

[0004] Therefore, there is an urgent need to realize a variable three-state output voltage control circuit of a power module that can provide stable and safe power supply for complex and diverse payloads. Summary of the invention

[0005] In order to address the deficiencies in the prior art, the purpose of the present invention is to provide a variable three-state output voltage control circuit for a power module and an implementation method thereof. The circuit and its implementation method not only enable a single power supply to provide stable and safe power supply for complex and diverse payloads, but also greatly improve the adaptability and reliability of aerospace power supplies.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A variable three-state output voltage control circuit for a power module comprises a gating circuit unit, a voltage stabilizing circuit unit, an isolation transmission circuit unit, a variable three-state conversion circuit unit and a power module.

[0008] The selection circuit unit is used to automatically select the connection of different circuits according to the control signal; the voltage stabilization circuit unit is used to maintain the stability of the circuit voltage; the isolation transmission circuit unit is used for circuit isolation protection, level conversion and transmission; the variable three-state conversion circuit unit is used to control the change of the output voltage of the power module; the power module is used for voltage conversion and providing a stable DC voltage.

[0009] The input end of the selection circuit unit is connected to the control signal, and the output end is connected to the input end of the isolation transmission circuit unit; the input end of the voltage stabilizing circuit unit is connected to the input bus voltage Vin, and the output end of the voltage stabilizing circuit unit is connected to the input end of the isolation transmission circuit unit; the output end of the isolation transmission circuit unit is connected to the input end of the variable three-state conversion circuit unit; the output end of the variable three-state conversion circuit unit is connected to the power supply module.

[0010] Preferably according to the present invention, the gating circuit unit includes a switching diode V1 and a precision voltage reference V2.

[0011] The control signal is connected to the cathode end of the switching diode V1, the cathode end of the precision voltage reference V2, and the reference end of the precision voltage reference V2; the anode end of the switching diode V1 is connected to one end of the resistor R2 of the isolation transmission circuit unit; the anode end of the precision voltage reference V2 is connected to one end of the resistor R3 of the isolation transmission circuit unit.

[0012] Preferably according to the present invention, the voltage stabilizing circuit unit includes a resistor R1, a voltage stabilizing diode V3 and a capacitor C1.

[0013] One end of the resistor R1 is connected to the input bus voltage Vin of the power module, and the other end of the resistor R1 is connected to the cathode end of the voltage regulator diode V3; the anode end of the voltage regulator diode V3 is connected to the input bus ground; one end of the capacitor C1 is connected to the cathode end of the voltage regulator diode V3, and the other end of the capacitor C1 is connected to the input bus ground.

[0014] Preferably according to the present invention, the isolation transmission circuit unit includes an isolation transmission circuit a and an isolation transmission circuit b.

[0015] The isolation transmission circuit a includes an optical coupler N1 and a resistor R3; the isolation transmission circuit b includes an optical coupler N2 and a resistor R2.

[0016] One end of the resistor R3 is connected to the anode end of the diode of the optocoupler N1, and the other end of the resistor R3 is connected to the anode end of the precision voltage reference V2 in the gating circuit unit; the cathode end of the diode in the optocoupler N1 is connected to the input bus ground; one end of the resistor R2 is connected to the cathode end of the diode in the optocoupler N2, and the other end of the resistor R2 is connected to the anode end of the switching diode V1 in the gating circuit unit; the anode end of the optocoupler N2 is connected to one end of the capacitor C1 of the voltage stabilizing circuit unit; the emitter of the optocoupler N1 is connected to the collector of the optocoupler N2.

[0017] Preferably, according to the present invention, the variable three-state conversion circuit unit includes a resistor R4 and a resistor R5;

[0018] One end of the resistor R4 is connected to the output voltage Vo of the power module, and the other end of the resistor R4 is connected to the collector of the transistor of the optocoupler N1 in the isolation transmission circuit unit; one end of the resistor R5 is connected to the output ground of the power module, and the other end of the resistor R5 is connected to the emitter of the transistor of the optocoupler N2 in the isolation transmission circuit unit; the node where the emitter of the optocoupler N1 and the collector of the optocoupler N2 are connected is connected to the adjustment end TRIM of the power module.

[0019] The present invention also includes a method for realizing the variable three-state output voltage control circuit of the power module, which is used to realize the three-state control of the variable output voltage with input and output isolation, and the method includes the following steps:

[0020] S1. When the input control signal is a TTL level signal and the voltage is at a low level, the switching diode V1 in the selection circuit unit is turned on, the diode of the optocoupler N1 in the isolation transmission circuit unit is turned off, the diode of the optocoupler N2 in the isolation transmission circuit unit is turned on, the transistor of the optocoupler N2 is saturated and turned on, the resistor R5 in the variable three-state conversion circuit is connected to the adjustment terminal TRIM of the power module, and the output voltage Vo increases.

[0021] S2. When the input control signal is a TTL level signal and the voltage is high, the precision voltage reference V2 of the selection circuit unit is turned on, the diode of the optocoupler N2 in the isolation transmission circuit unit is cut off, the diode of the optocoupler N1 in the isolation transmission circuit unit is turned on, the transistor is saturated and turned on, the resistor R4 in the variable three-state conversion circuit is connected to the adjustment terminal TRIM of the power module, and the output voltage Vo decreases.

[0022] S3. When the control signal input terminal is suspended, the diode of the optocoupler N1 is cut off, the diode of the optocoupler N2 is cut off, and the output voltage Vo of the power module is output normally.

[0023] Compared with the prior art, the advantages of the present invention are:

[0024] The present invention greatly improves the adaptability of the power supply and distribution system. Compared with the ordinary power supply system, the present invention can use the same power supply system to achieve the output of three different power supply voltages, and has the characteristics of simple structure, low cost, reliable operation, etc. At the same time, it can also realize the real-time switching of the three power supply voltages according to the needs of the working state of the equipment, which greatly increases the adaptability and reliability of the power supply. The present invention has been successfully applied to a certain flight control system. In actual use, the power supply has good stability and high reliability, and has been fully recognized by users. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a principle block diagram of a variable three-state output voltage control circuit of a power module in the present invention;

[0026] Figure 2 The invention discloses a variable three-state output voltage control circuit diagram of a power module. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings:

[0028] like Figure 1 A variable three-state output voltage control circuit of a power module is shown, and the circuit includes a gating circuit unit, a voltage stabilizing circuit unit, an isolation transmission circuit unit, a variable three-state conversion circuit unit and a power module. The present invention is directed to a variable three-state output voltage control circuit of a power module, and can realize variable voltage output of three states of output voltage by controlling the signal, and the input and output are isolated. The circuit design is concise, the structure is simple and flexible, the cost is low, the operation is reliable, and it has a significant economic effect.

[0029] like Figure 2 As shown, the gating circuit unit includes a switching diode V1 and a precision voltage reference V2. The control signal is connected to the cathode end of the switching diode V1, the cathode end of the precision voltage reference V2, and the reference end of the precision voltage reference V2; the anode end of the switching diode V1 is connected to one end of the resistor R2 of the isolation transmission circuit unit; and the anode end of the precision voltage reference V2 is connected to one end of the resistor R3 of the isolation transmission circuit unit.

[0030] like Figure 2 As shown, the voltage stabilizing circuit unit includes a resistor R1, a voltage stabilizing diode V3 and a capacitor C1. One end of the resistor R1 is connected to the input bus voltage Vin of the power module, and the other end of the resistor R1 is connected to the cathode end of the voltage stabilizing diode V3; the anode end of the voltage stabilizing diode V3 is connected to the input bus ground; one end of the capacitor C1 is connected to the cathode end of the voltage stabilizing diode V3, and the other end of the capacitor C1 is connected to the input bus ground.

[0031] like Figure 2 As shown, the isolation transmission circuit unit includes an isolation transmission circuit a and an isolation transmission circuit b. The isolation transmission circuit a includes an optocoupler N1 and a resistor R3; the isolation transmission circuit b includes an optocoupler N2 and a resistor R2. One end of the resistor R3 is connected to the anode end of the diode of the optocoupler N1, and the other end of the resistor R3 is connected to the anode end of the precision voltage reference V2 in the gating circuit unit; the cathode end of the diode in the optocoupler N1 is connected to the input bus ground; one end of the resistor R2 is connected to the cathode end of the diode in the optocoupler N2, and the other end of the resistor R2 is connected to the anode end of the switch diode V1 in the gating circuit unit; the anode end of the optocoupler N2 is connected to one end of the capacitor C1 of the voltage stabilizing circuit unit; the emitter of the optocoupler N1 is connected to the collector of the optocoupler N2.

[0032] like Figure 2 As shown, the variable three-state conversion circuit unit includes a resistor R4 and a resistor R5; one end of the resistor R4 is connected to the output voltage Vo of the power module, and the other end of the resistor R4 is connected to the collector of the transistor of the optocoupler N1 in the isolation transmission circuit unit; one end of the resistor R5 is connected to the output ground of the power module, and the other end of the resistor R5 is connected to the emitter of the transistor of the optocoupler N2 in the isolation transmission circuit unit; the node where the emitter of the optocoupler N1 and the collector of the optocoupler N2 are connected is connected to the adjustment end TRIM of the power module.

[0033] The working principle of the variable three-state output voltage control circuit of the above power module is:

[0034] The input bus voltage Vin passes through the current limiting resistor R1, the voltage stabilizing diode V3 and the capacitor C1 to ensure the stability of the power supply voltage of the optocoupler N2 in the optocoupler isolation transmission circuit unit. The resistor R2 is the current limiting resistor of the optocoupler N2, so that the diode current passing through the optocoupler N2 does not exceed its maximum forward current.

[0035] When the control signal TTL level is low, the switch diode V1 in the gate circuit unit is turned on, and the optocoupler N2 diode in the optocoupler isolation transmission circuit is turned on. By setting the resistor R5 of the variable three-state conversion circuit, the transistor in the optocoupler N2 is ensured to work in a saturated conduction state. The resistor R5 is connected to the TRIM terminal of the power module and forms a loop with the output circuit of the power module to increase the output voltage Vo of the power module.

[0036] Resistor R3 is the current limiting resistor of the optocoupler N1 in the optocoupler isolation transmission circuit unit, ensuring that the diode current of the optocoupler N1 does not exceed its maximum forward current. When the TTL level of the control signal is high, the high level exceeds the reference voltage of the precision voltage reference V2 of the selection circuit unit, the precision voltage reference V2 is turned on, and the diode of the optocoupler N1 in the optocoupler isolation transmission circuit unit is turned on. By setting the resistor R4 of the variable three-state conversion circuit, the transistor of the optocoupler N1 is ensured to work in a saturated conduction state. The resistor R4 is connected to the TRIM terminal of the power module and forms a loop with the output circuit of the power module to reduce the output voltage Vo of the power module.

[0037] When the control signal input terminal is suspended (no control signal), the diode of the optocoupler N1 in the optocoupler isolation transmission circuit is cut off, the diode of the optocoupler N2 is cut off, the resistors R4 and R5 of the variable three-state conversion circuit are disconnected from the TRIM terminal of the power module, and the output voltage Vo of the power module is output normally.

[0038] The present invention is applied to a power module variable three-state output voltage control circuit, and can achieve the effects of isolation, variable power output voltage, and three-state control by setting parameters of various components.

[0039] Assume that the input TTL signal is a high level +5V, +5V exceeds the reference voltage 2.5V built-in in the precision voltage reference V2, the voltage across the precision voltage reference V2 is 2.5V, the diode of the optocoupler N1 is turned on, the transistor of the optocoupler N1 is saturated and turned on, and the resistor R4 is connected to the TRIM terminal of the power module.

[0040] Usually the transmission ratio of the optocoupler CTR>50% is selected, and the saturation conduction of the optocoupler transistor meets the following conditions:

[0041] CTR×I F ﹥I C

[0042] Assume that the saturation conduction voltage drop of the optocoupler transistor is Vce, the current passing through the optocoupler transistor is Ic, and the output voltage of the power module is Vo. The approximate value of resistor R4 is:

[0043] R4≈Vo-IcVce

[0044] By properly selecting the parameters of the resistor R4, a voltage value smaller than the output voltage Vo of the power module can be obtained.

[0045] Assume that the input TTL signal is low level 0V, the switch diode V1 is turned on, the diode of the optocoupler N2 is turned on, and the current through the optocoupler diode is I F , the transistor of the optocoupler N2 is saturated and turned on, and the resistor R5 is connected to the TRIM terminal of the power module.

[0046] Usually the transmission ratio of the optocoupler CTR>50% is selected, and the saturation conduction of the optocoupler transistor meets the following conditions:

[0047] CTR×I F ﹥I C

[0048] Assume that the saturation conduction voltage drop of the optocoupler transistor is Vce, the current through the optocoupler transistor is Ic, and the voltage at the adjustment end of the power module is V TRIM The approximate value of resistor R5 is:

[0049]

[0050] By properly selecting the parameters of the resistor R5, a voltage value greater than the output voltage Vo of the power module can be obtained.

[0051] The variable three-state output voltage control circuit of the power module of the present invention and its implementation method are used in the output voltage state control of the aerospace power supply and distribution system. When the input control signal is a TTL signal and the voltage is low, the switch diode V1 of the gating circuit unit is turned on, the optocoupler N1 diode of the isolation transmission circuit is turned off, the optocoupler N2 diode of the isolation transmission circuit is turned on, the transistor of the optocoupler N2 is saturated and turned on, R5 of the variable three-state conversion circuit is connected to the adjustment end TRIM of the power module, and the output voltage Vo increases; when the input TTL signal voltage is high, the precision voltage reference V2 of the gating circuit unit is turned on, the optocoupler N2 diode of the isolation transmission circuit is turned off, the optocoupler N1 diode of the isolation transmission circuit is turned on, the transistor is saturated and turned on, R4 of the variable three-state conversion circuit is connected to the adjustment end TRIM of the power module, and the output voltage Vo decreases; when the control signal input end is suspended (no control signal), the diode of the optocoupler N1 is turned off, the diode of the optocoupler N2 is turned off, and the output voltage Vo of the power module is output normally, thereby realizing the three-state control of the variable output voltage of the input and output isolation.

[0052] The above-described embodiments are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the scope of protection determined by the claims of the present invention.

Claims

1. A variable three-state output voltage control circuit for a power module, characterized in that: The circuit includes a gating circuit unit, a voltage stabilizing circuit unit, an isolation transmission circuit unit, a variable three-state conversion circuit unit and a power supply module; The gating circuit unit is used to automatically select the connection of different circuits according to the control signal; the voltage stabilizing circuit unit is used to maintain the stability of the circuit voltage; the isolation transmission circuit unit is used for isolation protection, level conversion and transmission of the circuit; the variable three-state conversion circuit unit is used to control the change of the output voltage of the power module; the power module is used for voltage conversion and provides a stable DC voltage; The input end of the selection circuit unit is connected to the control signal, and the output end is connected to the input end of the isolation transmission circuit unit; the input end of the voltage stabilizing circuit unit is connected to the input bus voltage Vin, and the output end of the voltage stabilizing circuit unit is connected to the input end of the isolation transmission circuit unit; the output end of the isolation transmission circuit unit is connected to the input end of the variable three-state conversion circuit unit; the output end of the variable three-state conversion circuit unit is connected to the power supply module.

2. A power module variable three-state output voltage control circuit according to claim 1, characterized in that: The gating circuit unit includes a switching diode V1 and a precision voltage reference V2; The control signal is connected to the cathode terminal of the switching diode V1, the cathode terminal of the precision voltage reference V2, and the reference terminal of the precision voltage reference V2.

3. A power module variable three-state output voltage control circuit according to claim 2, characterized in that: The voltage stabilizing circuit unit includes a resistor R1, a voltage stabilizing diode V3 and a capacitor C1; One end of the resistor R1 is connected to the input bus voltage Vin of the power module, and the other end of the resistor R1 is connected to the cathode end of the voltage regulator diode V3; the anode end of the voltage regulator diode V3 is connected to the input bus ground; one end of the capacitor C1 is connected to the cathode end of the voltage regulator diode V3, and the other end of the capacitor C1 is connected to the input bus ground.

4. A power module variable three-state output voltage control circuit according to claim 3, characterized in that: The isolation transmission circuit unit includes an isolation transmission circuit a and an isolation transmission circuit b; The isolation transmission circuit a includes an optical coupler N1 and a resistor R3; the isolation transmission circuit b includes an optical coupler N2 and a resistor R2; One end of the resistor R3 is connected to the anode end of the diode of the optocoupler N1, and the other end of the resistor R3 is connected to the anode end of the precision voltage reference V2 in the gating circuit unit; the cathode end of the diode in the optocoupler N1 is connected to the input bus ground; one end of the resistor R2 is connected to the cathode end of the diode in the optocoupler N2, and the other end of the resistor R2 is connected to the anode end of the switching diode V1 in the gating circuit unit; the anode end of the optocoupler N2 is connected to one end of the capacitor C1 of the voltage stabilizing circuit unit; the emitter of the optocoupler N1 is connected to the collector of the optocoupler N2.

5. A power module variable three-state output voltage control circuit according to claim 4, characterized in that: The variable three-state conversion circuit unit includes a resistor R4 and a resistor R5; One end of the resistor R4 is connected to the output voltage Vo of the power module, and the other end of the resistor R4 is connected to the collector of the transistor of the optocoupler N1 in the isolation transmission circuit unit; one end of the resistor R5 is connected to the output ground of the power module, and the other end of the resistor R5 is connected to the emitter of the transistor of the optocoupler N2 in the isolation transmission circuit unit; the node where the emitter of the optocoupler N1 and the collector of the optocoupler N2 are connected is connected to the adjustment end TRIM of the power module.

6. The method for realizing the variable three-state output voltage control circuit of the power module according to claim 5, characterized in that: The method is used to realize three-state control of variable output voltage of input-output isolation, and the method comprises the following steps: S1, when the input control signal is a TTL level signal and the voltage is at a low level, the switch diode V1 in the selection circuit unit is turned on, the diode of the optocoupler N1 in the isolation transmission circuit unit is turned off, the diode of the optocoupler N2 in the isolation transmission circuit unit is turned on, the transistor of the optocoupler N2 is saturated and turned on, the resistor R5 in the variable three-state conversion circuit is connected to the adjustment terminal TRIM of the power module, and the output voltage Vo increases; S2, when the input control signal is a TTL level signal and the voltage is high, the precision voltage reference V2 of the selection circuit unit is turned on, the diode of the optocoupler N2 in the isolation transmission circuit unit is turned off, the diode of the optocoupler N1 in the isolation transmission circuit unit is turned on, the transistor is saturated and turned on, the resistor R4 in the variable three-state conversion circuit is connected to the adjustment terminal TRIM of the power module, and the output voltage Vo decreases; S3. When the control signal input terminal is suspended, the diode of the optocoupler N1 is cut off, the diode of the optocoupler N2 is cut off, and the output voltage Vo of the power module is output normally.

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