Boost power supply circuit suitable for space radiation environment and working method thereof

Abstract

The invention relates to a boost power supply circuit suitable for a space radiation environment and a working method thereof. The circuit comprises a driving square wave signal generation unit, a driving signal amplification unit, a boost unit and a voltage stabilization protection unit. The boost power supply circuit is composed of discrete device structures based on an amplifier (or a comparator), a diode, a triode, a power switch tube and a resistor-capacitor, and the boost power supply circuit is simple in structure, wide in input bus voltage range, high in loading capacity and high in reliability. And when the input bus voltage is lower than the minimum power supply voltage required by components such as a chip in the circuit, enough power supply voltage can be provided for the components. According to the range condition of the input bus in actual use, the voltage stabilization protection unit in the circuit can not be reserved when appropriate, and the circuit is further simplified.

Description

Technical Field

[0001] The invention relates to the technical field of DC / DC power supplies, and in particular to a boost power supply circuit suitable for space radiation environments and a working method thereof. Background Art

[0002] At present, common boost power supply circuits generally use boost chips to power subsequent loads. However, for the single particle effect of ionizing radiation in the space radiation environment, the common boost power supply circuit has no protection effect and cannot work in the space radiation environment. During use, it is usually necessary to add a thicker shielding layer, which will increase the weight and volume of the entire system and is not conducive to miniaturization and integrated design. The development of radiation-resistant boost chips is long and expensive. Therefore, the system urgently needs a boost power supply circuit that can still work normally and stably in an exposed space radiation environment. Summary of the invention

[0003] The purpose of the present invention is to provide a boost power supply circuit suitable for a space radiation environment and a working method thereof. The circuit can solve the deficiencies in the prior art and has the characteristics of simple design, easy implementation, low cost, high working stability, etc. According to the output bus range during actual use, the voltage stabilizing protection unit in the circuit may not be retained, thereby further simplifying the circuit.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A boost power supply circuit suitable for a space radiation environment comprises a driving square wave signal generating unit, a driving signal amplifying unit, a boost unit and a voltage stabilizing protection unit.

[0006] The square wave signal generating unit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, and an operational amplifier device N1; the driving signal amplifying unit includes an NPN transistor Q1 and a PNP transistor Q2; the boost unit includes an inductor L, a transistor Q3, a resistor R6, a resistor R7, a capacitor C2, and a diode D1; the voltage stabilizing protection unit includes a resistor R8, a resistor R9, a capacitor C3, a voltage stabilizing diode D2, an NPN transistor Q4, and an NPN transistor Q5.

[0007] The power supply end of the operational amplifier device N1 is respectively connected to the first end of the resistor R1 and the collector of the NPN transistor Q1; the positive input end of the operational amplifier device N1 is respectively connected to the second end of the resistor R1, the first end of the resistor R2, and the first end of the resistor R4; the negative input end of the operational amplifier device N1 is respectively connected to the first end of the capacitor C1 and the first end of the resistor R3; the output end of the operational amplifier device N1 is respectively connected to the second end of the resistor R3, the second end of the resistor R4, the base of the NPN transistor Q1, and the base of the PNP transistor Q2; the first end of the inductor L is connected to the positive end of the input voltage Vin, and the second end of the inductor L is respectively connected to the collector or drain of the transistor Q3 and the anode of the diode D1; the emitter of the NPN transistor Q1 is connected to the collector of the PNP transistor Q2 and then connected to the base or gate of the transistor Q3.

[0008] The ground terminal of the operational amplifier device N1, the second end of the resistor R2, the second end of the capacitor C1, the emitter of the NPN transistor Q2, the second end of the resistor R6, the second end of the capacitor C2, the second end of the resistor R7, the anode of the voltage regulator D2, the second end of the capacitor C3, and the ground terminal of the input voltage Vin are all grounded.

[0009] The emitter or source of the transistor Q3 is connected to the first end of the resistor R6; the cathode of the diode D1 is respectively connected to the first end of the capacitor C2, the first end of the resistor R7, the first end of the resistor R8, and the first end of the resistor R9.

[0010] The base of the NPN transistor Q4 is respectively connected to the cathode of the voltage regulator D2, the first end of the capacitor C3, and the second end of the resistor R8; the collector of the NPN transistor Q4 is respectively connected to the second end of the resistor R9 and the collector of the NPN transistor Q5; the emitter of the NPN transistor Q4 is connected to the base of the NPN transistor Q5.

[0011] Preferably according to the present invention, the operational amplifier device N1 is an amplifier or a comparator.

[0012] Preferably according to the present invention, the transistor Q3 is an enhancement type N-channel MOSFET or a power NPN transistor.

[0013] Preferably according to the present invention, the diode D1 is a Schottky diode.

[0014] Preferably, the square wave signal generating unit further comprises a resistor R5; the resistor R5 is a pull-up resistor; the first end of the resistor R5 is connected to the power supply end of the operational amplifier device N1, and the second end of the resistor R5 is connected to the output end of the operational amplifier device N1. The pull-up resistor R5 can be removed from the circuit.

[0015] According to the preferred embodiment of the present invention, the resistance value of the resistor R6 should be determined according to the actual use situation to ensure that the transistor Q3 is fully turned on. The voltage stabilizing value of the voltage stabilizing tube D2 should be able to meet the normal operation of the subsequent load.

[0016] The present invention also includes a working method of the above-mentioned boost power supply circuit suitable for space radiation environment, the method comprising the following steps:

[0017] S1, op amp device N1 outputs driving square wave signal

[0018] After the input voltage Vin is divided by the resistors R1 and R2, a positive potential exists at the input positive terminal of the operational amplifier device N1. Since the voltage across the capacitor C1 is 0 in the initial state, the potential of the input positive terminal of the operational amplifier device N1 is higher than that of the input negative terminal, thereby flipping the output of the operational amplifier device N1. After flipping, the operational amplifier device N1 outputs a high level. The capacitor C1 is charged through the feedback resistor R3, and the input negative terminal level of the operational amplifier device N1 gradually increases until the input negative terminal level of the operational amplifier device N1 is higher than the input positive terminal level. The output of the operational amplifier device N1 flips again. After flipping, the operational amplifier device N1 outputs a low level. The capacitor C1 discharges until the input negative terminal voltage of the operational amplifier device N1 is lower than the input positive terminal voltage. The operational amplifier device N1 flips again and outputs a high level. This cycle is repeated, and the operational amplifier device N1 outputs a driving square wave signal with a fixed frequency and a duty cycle of D.

[0019] S2, totem pole output drive signal

[0020] The driving square wave signal output by the operational amplifier device N1 passes through the totem pole circuit composed of transistors Q1 and Q2, and then outputs the driving signal for controlling the on and off of transistor Q3. The driving square wave signal output by the operational amplifier device N1 has a weak driving capability, and the driving capability is enhanced after passing through the totem pole composed of transistors Q1 and Q2, forming a driving signal for controlling the on and off of transistor Q3.

[0021] S3, boost conversion and voltage stabilization amplification output

[0022] The inductor L, the transistor Q3, the diode D1, the capacitor C2 and the resistor R7 form a Boost converter, which increases the output voltage to Vin / (1-D) through the Boost converter. After the output voltage is increased to Vin / (1-D), it is stabilized to the stabilization value of the zener tube D2 by the zener tube D2, and finally amplified by the NPN transistor Q4 and the NPN transistor Q5 to provide a stable power supply voltage for the subsequent load. The input voltage Vin is boosted to a higher voltage level by the Boost converter, then stabilized by the zener tube D2, and finally further amplified by the NPN transistor Q4 and the NPN transistor Q5 to ensure that the subsequent load can obtain a stable and sufficient power supply voltage.

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

[0024] (1) The present invention provides a power supply solution suitable for a circuit in a space radiation environment when the input bus voltage is lower than the minimum voltage required by components such as chips in the circuit. The present invention adopts a discrete device structure based on MOSFET, diode, triode, amplifier, comparator, resistor and capacitor, which has a simple structure and strong radiation resistance. It can provide a stable power supply voltage when the input voltage is lower than the minimum operating voltage of components such as chips in the circuit and when there is a large range of fluctuations. The circuit described in the present invention can simplify the output power and circuit according to the use requirements. The present invention is based on the existing mature diodes, triodes, resistors and capacitors and MOSFET devices, and the logic control circuit structure is simple and the technical path is easy to implement. The circuit design is flexible and the circuit can be adjusted according to the actual use situation. The present invention can break the foreign embargo, the technical solution is independent and controllable, and the components are low in cost and highly available.

[0025] (2) The main innovation of the present invention is that it can boost the voltage in a space radiation environment to achieve a stable power supply voltage by driving a square wave signal generating unit, a driving signal amplifying unit, a boosting unit, and a voltage stabilizing protection unit, which solves the problem of circuit failure caused by total dose and single particle effect in the current boosting chip in the space radiation environment. The space radiation environment is special. Conventional boosting chips will fail due to ionizing radiation and heavy ion radiation and cannot work normally in the space radiation environment. The boosting circuit constructed based on the existing mature devices of the present invention solves the power supply problem when the bus input voltage is lower than the minimum working voltage of components such as chips in the circuit in the space radiation environment.

[0026] (3) The boost power supply circuit proposed in the present invention adopts an open-loop BOOST as the main circuit. By adjusting the parameters of the inductor and the switch tube, it can have a strong load capacity and can supply power to multiple chips or other components at the same time. In addition, in situations where the input voltage fluctuates slightly, the circuit can also be used as an independent power supply. Compared with traditional power supply units, the boost power supply unit proposed in the present invention has the characteristics of strong load capacity and diverse uses. The use of an amplifier as a driving signal source for the switch tube of the BOOST boost circuit proposed in the present invention does not require a PWM control chip. Compared with the traditional BOOST boost circuit, it has the characteristics of simple structure, wide input voltage range, and normal operation even at low input voltage. The boost power supply circuit proposed in the present invention can be used under normal conditions and is also suitable for use in space radiation environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The boost power supply circuit principle of the present invention is suitable for space radiation environment Figure 1 ;

[0028] Figure 2 The boost power supply circuit principle of the present invention is suitable for space radiation environment Figure 2 ;

[0029] Figure 3 The boost power supply circuit principle of the present invention is suitable for space radiation environment Figure 3 ;

[0030] Figure 4 The boost power supply circuit principle of the present invention is suitable for space radiation environment Figure 4 ;

[0031] Figure 5 This is a 5V to 12V startup waveform diagram of a 5V to 12V circuit designed and constructed based on the present invention.

[0032] in:

[0033] 1. Driving square wave signal generating unit, 2. Driving signal amplifying unit, 3. Voltage boosting unit, 4. Voltage stabilizing protection unit. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings:

[0035] like Figure 1 and Figure 2 A boost power supply circuit suitable for a space radiation environment is shown, and the circuit comprises a driving square wave signal generating unit 1, a driving signal amplifying unit 2, a boost unit 3, and a voltage stabilizing protection unit 4.

[0036] The boost power supply circuit proposed in the present invention mainly provides a solution to the problem that the input voltage in the electronic system is lower than the normal working voltage range of some chips in the system. The boost circuit can increase the low input voltage and has a strong load capacity. In addition, the present invention uses an amplifier as a signal source to drive the switch tube in the switching power supply circuit, providing a new driving method suitable for the open-loop system of the switching power supply; without the need to use a complex PWM control chip, the circuit structure can be greatly simplified.

[0037] In some embodiments, the driving square wave signal generating unit 1 includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, and an amplifier or a comparator N1. The resistor R5 is a pull-up resistor, and the pull-up resistor R5 can be removed from the circuit.

[0038] The driving square wave signal generating unit 1 is used to generate a stable square wave signal. Resistors R1 and R2 form a voltage divider network to provide a reference voltage for the inverting input terminal of N1. This reference voltage determines the threshold point of the square wave signal. Resistor R3 and capacitor C1 form an integrator or delay link. When the input voltage exceeds the threshold, capacitor C1 is charged through resistor R3, and when the voltage drops, capacitor C1 is discharged through resistor R3. The charging and discharging process of capacitor C1 determines the frequency and duty cycle of the square wave. Resistor R4 is connected between the output and the non-inverting input terminal of N1 to form a positive feedback loop. Positive feedback enhances the flipping characteristics of N1, giving it a hysteresis characteristic, that is, Schmitt trigger behavior. This means that the comparator has different thresholds when rising and falling, preventing oscillation caused by noise. Amplifier or comparator N1 is responsible for the actual voltage comparison. When the input voltage exceeds the set threshold, the output quickly switches state, from a high level to a low level or vice versa, thereby generating a square wave signal. Resistor R5 is a pull-up resistor used to ensure that the output remains in a high state when no other signal drives it. In a Schmitt trigger or comparator circuit, if the output of N1 is already able to directly drive the subsequent circuit, or the subsequent circuit itself has a high input impedance, then resistor R5 is not necessary. The role and optionality of pull-up resistor R5 In many cases, the output of the comparator or amplifier is internally designed to have sufficient driving capability to directly drive the subsequent circuit without relying on an external pull-up resistor. In such a circuit, the pull-up resistor R5 can be removed to simplify the circuit design and reduce costs. However, if the output needs to remain at a high level in an inactive state, or the input impedance of the subsequent circuit is not high enough to directly draw enough current from the output to maintain a high state, then the pull-up resistor is still necessary. In practical applications, whether to retain the pull-up resistor R5 depends on the needs and design considerations of the specific circuit. The driving square wave signal generating unit 1 generates a square wave signal through the hysteresis characteristics of the comparator or amplifier N1, and determines the frequency and duty cycle of the signal through the RC network (R3 and C1). The necessity of the pull-up resistor R5 depends on the characteristics of the subsequent circuit, and if it can be omitted, the circuit design can be simplified.

[0039] In some embodiments, the driving signal amplifying unit 2 includes an NPN transistor Q1 and a PNP transistor Q2.

[0040] The drive signal amplification unit 2 uses two types of transistors, NPN and PNP, to form a complementary symmetrical output stage / push-pull output stage, which is used to effectively amplify the signal and drive the load without causing DC bias. The drive signal amplification unit composed of NPN transistor Q1 and PNP transistor Q2 can efficiently amplify the input signal and convert it into a power signal sufficient to drive a larger load. This configuration utilizes the switching characteristics of the transistor to avoid DC bias in the output signal, and is suitable for applications requiring high power output.

[0041] In some embodiments, the boost unit 3 includes an inductor L, a power transistor Q3, a resistor R6, a resistor R7, a capacitor C2 and a Schottky diode D1. The transistor Q3 is an N-channel MOSFET or a power NPN transistor. The value of the voltage R6 needs to ensure that the transistor Q3 is fully turned on.

[0042] The boost unit 3 is a Boost converter circuit for boosting the input voltage to a higher output voltage. The transistor Q3 can be an N-channel MOSFET or an NPN power transistor. MOSFET is usually selected because it has a lower on-resistance and a faster switching speed, which is suitable for high-frequency switching applications. Transistor Q3 acts as a main switch and is turned on and off according to the pulse width modulation (PWM) of the control signal. When the transistor Q3 is turned on, the inductor L is charged; when the transistor Q3 is turned off, the inductor L begins to discharge and the voltage is boosted. The inductor L stores energy when the transistor Q3 is turned on and releases energy when the transistor Q3 is turned off. The size of the inductor L determines the output voltage ripple and efficiency of the circuit. When the transistor Q3 is turned off, the current in the inductor L flows to the load and the output capacitor C2 through the diode D1. The diode D1 prevents the output voltage from flowing back to the input side, ensuring that the energy can only flow in one direction. The output capacitor C2 is used to smooth the output voltage and reduce the ripple. The larger the capacity of the capacitor C2, the better the stability of the output voltage. Resistor R6 is used to limit the drive current of transistor Q3 to prevent electromagnetic interference and voltage spikes caused by too fast switching speed. The value of resistor R6 should ensure that transistor Q3 can be turned on quickly and completely under the action of the drive signal, but at the same time avoid excessive transient current. Resistor R7 is used to provide a bias or as a protection resistor to limit the gate-source voltage of transistor Q3 to prevent damage to the transistor. Resistor R7 is a dead load in the BOOST circuit, and its main function is to discharge the filter capacitor in the circuit. In the Boost converter, when transistor Q3 is turned on, inductor L is charged and energy is stored in the magnetic field of the inductor. When transistor Q3 is turned off, inductor L tries to keep the current unchanged, but due to the blocking of transistor Q3, the current flows to capacitor C2 and the load through diode D1. At this time, inductor L releases energy. Due to the voltage direction across the inductor, the output voltage is boosted to a voltage higher than the input voltage. Duty cycle D is the ratio of the on-time of transistor Q3 to the total switching cycle time.

[0043] In some embodiments, the voltage stabilizing protection unit 4 includes a resistor R8, a resistor R9, a capacitor C3, a voltage stabilizing tube D2, an NPN transistor Q4 and a PNP transistor Q5. The voltage stabilizing value of the voltage stabilizing tube D2 should ensure the normal operation of the subsequent load.

[0044] The voltage stabilizing protection unit 4 is a key part for stabilizing the output voltage and protecting the subsequent circuit from voltage fluctuations. The voltage regulator D2 is used to maintain a constant voltage under reverse bias conditions. The selection of the voltage regulator D2 should be based on the operating voltage required by the subsequent load to ensure that the output voltage is stable near this voltage value, even if the input voltage or load conditions change. The NPN transistor Q4 and the PNP transistor Q5 form a composite transistor pair for amplifying the control signal of the voltage regulator D2 and then adjusting the output voltage. The combination of the NPN transistor Q4 and the PNP transistor Q5 can provide a higher current gain than a single transistor, thereby more effectively controlling the output voltage. Resistors R8 and R9 are used to set the reference current of the voltage regulator D2. The voltage stabilizing performance of the voltage regulator D2 is affected by the reference current, and an appropriate reference current helps to improve the voltage stabilization accuracy. Resistors R8 and R9 may also be used to bias Q4 and Q5 to ensure that they operate in the correct operating area. Capacitor C3 is used for filtering, which can reduce high-frequency noise on the output voltage and provide a smoother DC voltage.

[0045] Specifically, the power supply end of N1 is respectively connected to the first end of R1, the first end of the resistor R5, the collector of the NPN transistor Q1, the first end of the inductor L, and the positive end of the circuit Vin. The positive end of N1 is respectively connected to the second end of the resistor R1, the first end of the resistor R2, and the first end of the resistor R4; the negative end of N1 is respectively connected to the first end of the capacitor C1 and the first end of the resistor R3; the output end of N1 is respectively connected to the second end of the resistor R5, the second end of the resistor R3, the second end of the resistor R4, the base of the NPN transistor Q1, and the base of the PNP transistor Q2. The ground end of N1 is respectively connected to the second end of the resistor R2, the second end of the capacitor C1, the emitter of the NPN transistor Q2, the second end of the resistor R6, the second end of the capacitor C2, the second end of the resistor R7, the anode of the voltage regulator D2, the second end of the capacitor C3, and the ground end of the input voltage Vin.

[0046] The base or gate of the transistor Q3 is respectively connected to the emitter of the NPN transistor Q1 and the collector of the PNP transistor Q2; the collector or drain of the transistor Q3 is respectively connected to the second end of the inductor L and the anode of the Schottky diode D1; the emitter or source of the transistor Q3 is connected to the first end of the resistor R6. The cathode of the diode D1 is respectively connected to the first end of the capacitor C2, the first end of the resistor R7, the first end of the resistor R8, and the first end of the resistor R9. Preferably, the transistor Q3 is an enhancement type N-channel MOSFET or a power NPN transistor. Figure 1 and Figure 3In the embodiment shown, transistor Q3 is a power NPN transistor. Figure 1 and Figure 3 In the embodiment, the base of the transistor Q3 is respectively connected to the emitter of the NPN transistor Q1 and the collector of the PNP transistor Q2; the collector of the transistor Q3 is respectively connected to the second end of the inductor L and the anode of the Schottky diode D1; the emitter of the transistor Q3 is connected to the first end of the resistor R6. Figure 2 and Figure 4 In the embodiment shown, the transistor Q3 is an enhancement type N-channel MOSFET. The gate of the transistor Q3 is respectively connected to the emitter of the NPN transistor Q1 and the collector of the PNP transistor Q2; the drain of the transistor Q3 is respectively connected to the second end of the inductor L and the anode of the Schottky diode D1; the source of the transistor Q3 is connected to the first end of the resistor R6.

[0047] The base of the NPN transistor Q4 is respectively connected to the cathode of the voltage regulator D2 and the first end of the capacitor C3; the collector of the NPN transistor Q4 is respectively connected to the second end of the resistor R9 and the collector of the NPN transistor Q5; the emitter of the NPN transistor Q4 is connected to the base of the NPN transistor Q5.

[0048] In some applications, when the boosted voltage within the input bus voltage range can enable the subsequent load to work normally, the voltage stabilizing protection unit 4 in the circuit can be removed. In this case, another circuit structure diagram of the present invention is as follows: Figure 3 and Figure 4 As shown. Figure 3 and Figure 4 As shown, the circuit removes the resistor R8, the resistor R9, the capacitor C3, the voltage regulator tube D2, the NPN transistor Q4, and the NPN transistor Q5 in the voltage stabilizing protection unit 4.

[0049] The working principle of the boost power supply circuit suitable for space radiation environment described in the present invention is:

[0050] S1, after the input voltage Vin is divided by the voltage-dividing resistors R1 and R2, a positive potential exists at the positive end of the amplifier or comparator N1. Since the voltage across the capacitor C1 is 0 in the initial state, the potential at the positive input end of the amplifier or amplifier N1 is higher than the negative input end, causing the amplifier or amplifier N1 to flip. After the amplifier or amplifier N1 flips, it outputs a high level, and charges the capacitor C1 through the feedback resistor R3. The level of the negative input end of the amplifier or amplifier N1 gradually increases until the level of the negative input end is higher than the positive input end. The amplifier or amplifier N1 flips again. After flipping, the amplifier or amplifier N1 outputs a low level, and the capacitor C1 discharges until the voltage at the negative input end of the amplifier or amplifier N1 is lower than the voltage at the positive input end. The amplifier or amplifier N1 flips again and outputs a high level. This cycle is repeated, and N1 outputs a driving square wave signal with a fixed frequency and a duty cycle of D.

[0051] The driving square wave signal output by S2, the amplifier or the amplifier N1 has a relatively weak driving capability, but its driving capability is enhanced after passing through the totem pole formed by the transistor Q1 and the transistor Q2, thereby forming a driving signal for controlling the transistor Q3 to be turned on and off.

[0052] S3, the inductor L, the transistor Q3, the Schottky diode D1, the capacitor C2, and the resistor R7 form a BOOST converter circuit for boosting the voltage to increase the output voltage to Vin / (1-D). The output voltage is increased to Vin / (1-D) and stabilized to the voltage value of the D2 tube by the voltage regulator tube D2, and amplified by the NPN transistors Q4 and Q5 to provide a stable power supply voltage for subsequent loads.

[0053] In electronic systems, when the power supply voltage of the electronic system is low, the input bus voltage often fails to provide sufficient power supply voltage to certain electronic chips or electronic components in the electronic system. Providing sufficient voltage to the chips or electronic components in the electronic system is the key to the operation of the electronic system. For example, for the laser communication allegro mirror in the satellite payload, since it needs to take power from the secondary power supply with an output of 5V and increase the voltage to the laser communication allegro mirror power supply voltage of 120V, a 5V to 120V DC / DC power supply needs to be designed. However, since the radiation-resistant PWM controller requires at least 9V power supply, the first problem that needs to be solved is to increase the 5V power supply to at least 9V to meet the power supply requirements of the radiation-resistant PWM controller. Figure 5 This is a 5V to 12V circuit designed and constructed based on the present invention, and the output voltage curve when the output load is 0.3A. Figure 5 In the example, channel 1 is the input voltage and channel 2 is the output voltage. Figure 5 It can be seen that the startup process is normal with a 3.6W load and the output voltage is also normal.

[0054] For the case of low voltage to high voltage, the traditional method is to boost the input bus voltage through a boost chip, but since there is no radiation-resistant boost chip, this method is not suitable for aerospace equipment that needs to work in a space environment radiation environment. By consulting the literature and related materials, it can be seen that there are reports on boost circuit solutions that are still applicable when the bus voltage is lower than 9V in a space environment. The boost unit proposed in the present invention is based on an open-loop BOOST boost circuit. At present, the power supply voltage of the PWM control chip of the DC / DC power supply in aerospace is required to be at least higher than 9V. When the input voltage is lower than 9V, the PWM control chip cannot work normally, so it is impossible to use the radiation-resistant PWM chip to build a boost circuit for low voltage input. In order to solve this problem, the present invention innovatively proposes to use a comparator as the PWM signal generation source of the BOOST circuit switch tube, which does not belong to the conventional technology and use methods in the field of DC / DC power supply in a space radiation environment and a non-space radiation environment, and is obtained by the inventor after creative labor. In addition, it should be noted that the various technical features in the present invention are an interrelated and inseparable overall solution, and a new boost circuit solution is formed based on each circuit unit. We should not separate them by ignoring their effects in the overall plan. The work of deriving, transforming and combining the features of different traditional ways or methods to form new plans and technical paths requires creative labor in itself.

[0055] To sum up, the self-excited isolated power supply circuit suitable for neutron radiation environment proposed in the present invention is mainly based on existing mature diodes, resistors and capacitors, crystal triodes and MOSFET devices, and through suitable driving circuits, boost circuits and voltage stabilizing protection circuits, a boost power supply circuit within a wide input voltage range is realized.

[0056] 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 boost power supply circuit suitable for space radiation environment, It is characterized in that The boost power supply circuit comprises: a driving square wave signal generating unit (1), a driving signal amplifying unit (2) and a boost unit (3); The square wave signal generating unit (1) comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, and an operational amplifier device N1; the driving signal amplifying unit (2) comprises an NPN transistor Q1 and a PNP transistor Q2; the boosting unit (3) comprises an inductor L, a transistor Q3, a resistor R6, a resistor R7, a capacitor C2, and a diode D1; The power supply end of the operational amplifier device N1 is respectively connected to the first end of the resistor R1 and the collector of the NPN transistor Q1; the positive input end of the operational amplifier device N1 is respectively connected to the second end of the resistor R1, the first end of the resistor R2, and the first end of the resistor R4; the negative input end of the operational amplifier device N1 is respectively connected to the first end of the capacitor C1 and the first end of the resistor R3; the output end of the operational amplifier device N1 is respectively connected to the second end of the resistor R3, the second end of the resistor R4, the base of the NPN transistor Q1, and the base of the PNP transistor Q2; the first end of the inductor L is connected to the positive end of the input voltage Vin, and the second end of the inductor L is respectively connected to the collector or source of the transistor Q3 and the anode of the diode D1; the emitter of the NPN transistor Q1 is connected to the collector of the PNP transistor Q2 and then connected to the base or gate of the transistor Q3; The ground terminal of the operational amplifier device N1, the second terminal of the resistor R2, the second terminal of the capacitor C1, the emitter of the NPN transistor Q2, the second terminal of the resistor R6, the second terminal of the capacitor C2, the second terminal of the resistor R7, and the ground terminal of the input voltage Vin are all grounded; The emitter of the transistor Q3 is connected to the first end of the resistor R6; the cathode of the diode D1 is connected to the first end of the capacitor C2, the first end of the resistor R7, and the first end of the resistor R8 respectively.

2. The boost power supply circuit suitable for space radiation environment according to claim 1, It is characterized in that The boost power supply circuit also includes: a voltage stabilization protection unit (4); The voltage stabilizing protection unit (4) comprises a resistor R8, a resistor R9, a capacitor C3, a voltage stabilizing tube D2, an NPN transistor Q4 and an NPN transistor Q5; The anode of the voltage regulator tube D2 and the second end of the capacitor C3 are both grounded; The emitter or source of the transistor Q3 is connected to the first end of the resistor R9; The base of the NPN transistor Q4 is respectively connected to the cathode of the voltage regulator D2, the first end of the capacitor C3, and the second end of the resistor R8; the collector of the NPN transistor Q4 is respectively connected to the second end of the resistor R9 and the collector of the NPN transistor Q5; the emitter of the NPN transistor Q4 is connected to the base of the NPN transistor Q5.

3. The boost power supply circuit suitable for space radiation environment according to claim 1, It is characterized in that The operational amplifier device N1 is an amplifier or a comparator.

4. The boost power supply circuit suitable for use in a space radiation environment according to claim 1, It is characterized in that The transistor Q3 is an enhancement type N-channel MOSFET or a power NPN transistor.

5. The boost power supply circuit suitable for use in a space radiation environment according to claim 1, It is characterized in that The diode D1 is a Schottky diode.

6. The boost power supply circuit suitable for use in a space radiation environment according to claim 1, It is characterized in that The square wave signal generating unit (1) further comprises a resistor R5; The resistor R5 is a pull-up resistor; A first end of the resistor R5 is connected to a power supply end of the operational amplifier device N1 , and a second end of the resistor R5 is connected to an output end of the operational amplifier device N1 .

7. A working method of a boost power supply circuit suitable for space radiation environment, It is characterized in that The method is implemented using the boost power supply circuit as claimed in claim 2, and the method comprises the following steps: S1, op amp device N1 outputs driving square wave signal After the input voltage Vin is divided by the resistors R1 and R2, a positive potential exists at the input positive terminal of the operational amplifier device N1. Since the voltage across the capacitor C1 is 0 in the initial state, the potential of the input positive terminal of the operational amplifier device N1 is higher than that of the input negative terminal, thereby causing the output of the operational amplifier device N1 to flip. After flipping, the operational amplifier device N1 outputs a high level. The capacitor C1 is charged through the feedback resistor R3, and the input negative terminal level of the operational amplifier device N1 gradually increases until the input negative terminal level of the operational amplifier device N1 is higher than the input positive terminal level. The output of the operational amplifier device N1 flips again. After flipping, the operational amplifier device N1 outputs a low level. The capacitor C1 is discharged until the input negative terminal voltage of the operational amplifier device N1 is lower than the input positive terminal voltage. The operational amplifier device N1 flips again and outputs a high level. This cycle is repeated, and the operational amplifier device N1 outputs a driving square wave signal with a fixed frequency and a duty cycle of D. S2, totem pole output drive signal The driving square wave signal output by the operational amplifier device N1 passes through the totem pole circuit composed of transistors Q1 and Q2, and then outputs the driving signal for controlling the on and off of transistor Q3; S3, boost conversion and voltage stabilization amplification output The inductor L, the transistor Q3, the diode D1, the capacitor C2 and the resistor R7 form a Boost converter, which increases the output voltage to Vin / (1-D) through the Boost converter. After the output voltage is increased to Vin / (1-D), it is stabilized by the voltage regulator D2 to the stabilization value of the voltage regulator D2, and finally amplified by the NPN transistor Q4 and the NPN transistor Q5 to provide a stable power supply voltage for the subsequent load.

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