A negative ignition sustaining power supply for laser gyroscopes

Abstract

This invention discloses a negative ignition sustaining power supply for a laser gyroscope, comprising a BOOST power module, a multi-stage voltage multiplier module, and a feedback circuit. The multi-stage voltage multiplier module includes multiple voltage multiplier units, each of which includes a first voltage multiplier diode D01, a second voltage multiplier diode D02, and a first voltage multiplier capacitor C01. The first connection terminal of the first-stage voltage multiplier unit is connected to ground (GND). The anode of the first voltage multiplier diode D01 and the cathode of the second voltage multiplier diode D02 are both connected to the output terminal of the BOOST power module. The second connection terminal of the last-stage voltage multiplier unit forms the output terminal of the voltage multiplier circuit. This invention can reduce the impact of temperature drift caused by circuit efficiency, reduce ripple voltage output, and lower the withstand voltage requirements of components.

Description

Technical Field

[0001] This utility model relates to the field of inertial navigation technology, specifically to a negative ignition sustaining power supply for a laser gyroscope. Background Technology

[0002] The negative ignition and sustaining power supply for a laser gyroscope is a key component used to start and maintain the operation of the laser gyroscope, a high-precision inertial navigation device widely used in aerospace, military, and industrial fields. The main function of the ignition power supply is to provide the high voltage (absolute value greater than 2000V) required for startup to excite the laser medium and generate laser light, and to maintain a stable discharge state during operation. The main function of the sustaining power supply is to provide the voltage required for the laser gyroscope to operate.

[0003] Existing technical solutions include flyback switching power supplies composed of L6565 and transformers. However, due to the application environment requiring high switching frequencies for ignition and maintenance, and the significant losses of the transformer at high switching frequencies, the circuit efficiency is low. For high-precision and sensitive sensors like laser gyroscopes, low circuit efficiency can lead to a heat source in the laser gyroscope's operating environment, affecting the gyroscope's temperature drift and increasing the risk of deteriorating gyroscope accuracy. Utility Model Content

[0004] To address the problems in the background technology, this utility model proposes a laser gyroscope positive ignition power supply that can reduce the impact of temperature drift caused by circuit efficiency, ripple voltage output, and the withstand voltage requirements of components.

[0005] The present invention adopts the following technical solution:

[0006] A negative ignition sustaining power supply for a laser gyroscope includes: a BOOST power module, a multi-stage voltage multiplier module, and a feedback circuit. The multi-stage voltage multiplier module includes multiple voltage multiplier units. Each voltage multiplier unit includes a first voltage multiplier diode D01, a second voltage multiplier diode D02, and a first voltage multiplier capacitor C01. The cathode of the first voltage multiplier diode D01 is connected to one end of the first voltage multiplier capacitor C01, forming a first connection terminal A. The anode of the second voltage multiplier diode D02 is connected to the other end of the first voltage multiplier capacitor C01, forming a second connection terminal B. The anode of the first voltage multiplier diode D01 is connected to the cathode of the second voltage multiplier diode D02, forming a third connection terminal C. The second connection terminal B of the previous voltage multiplier unit is connected to the first connection terminal A of the next voltage multiplier unit.

[0007] The first connection terminal of the first-stage voltage multiplier unit is connected to ground (GND), the third connection terminal of the first-stage voltage multiplier unit is connected to the output terminal of the BOOST power module, and the second connection terminal of the last-stage voltage multiplier unit forms the output terminal of the voltage multiplier circuit.

[0008] The second connection terminal of the Nth stage voltage multiplier unit is connected to the input terminal of the feedback circuit, and the output terminal of the feedback circuit is connected to the feedback terminal of the BOOST power module.

[0009] Optionally, each voltage multiplier unit also includes a second voltage multiplier capacitor C02. The second voltage multiplier capacitor C02 of the subsequent voltage multiplier unit is located between the third connection terminal of the subsequent voltage multiplier unit and the third connection terminal of the previous voltage multiplier unit. The second voltage multiplier capacitor C02 of the first voltage multiplier unit is located between the third connection terminal of the first voltage multiplier unit and the output terminal of the BOOST power module.

[0010] Optionally, the BOOST power module includes a quasi-resonant chip U1, an inductor L1, and an N-MOS transistor Q1.

[0011] The power supply is connected to one end of capacitor C21, the other end of capacitor C21 is connected to ground GND, the power supply is connected to pin 1 VIN of quasi-resonant chip U1, and pin 6 GND of quasi-resonant chip U1 is connected to the circuit ground GND.

[0012] The power supply is connected to resistor R4, the other end of resistor R4 is connected to one end of resistor R5, the other end of resistor R5 is connected to ground GND, and the connection point of resistors R4 and R5 is connected to pin 7 UVLO of quasi-resonant chip U1.

[0013] Pin 10 (SS) of the quasi-resonant chip U1 is connected to ground (GND) through capacitor C23, and pin 4 (VCC) of the quasi-resonant chip U1 is connected to ground (GND) through capacitor C22.

[0014] Pin 9 (RT) of the quasi-resonant chip U1 is connected to resistor R1, and the other end of resistor R1 is connected to ground (GND); pin 5 (OUTPUT) of the quasi-resonant chip U1 is connected to the gate of N-MOS transistor Q1.

[0015] The power supply is connected to one end of inductor L1, and the other end of inductor L1 is connected to the drain of N-MOS transistor Q1. The connection between the drain of N-MOS transistor Q1 and the inductor L1 forms the output terminal of the power module. The source of N-MOS transistor Q1 is connected to one end of the sampling resistor, and the other end of the sampling resistor is connected to ground GND.

[0016] The output of the feedback circuit is connected to pin 2 (FB) of the quasi-resonant chip U1.

[0017] Optionally, it also includes an RC filter circuit, which includes a resistor R7, a capacitor C25, and a resistor R10.

[0018] The source of N-MOS transistor Q1 is also connected to one end of resistor R7. The other end of resistor R7 is connected to one end of capacitor C25 and one end of resistor R10. The other end of capacitor C25 is grounded, and the other end of resistor R10 is connected to pin 8 CS of quasi-resonant chip U1.

[0019] Optionally, it also includes a ramp compensation circuit, which includes capacitor C24, resistor R9, and resistor R8.

[0020] Pin 2 (FB) of the quasi-resonant chip U1 is connected to one end of capacitor C24 and one end of resistor R9. The other end of capacitor C24 is connected to one end of resistor R8. The other end of resistor R8 is connected to pin 3 (COMP) of the quasi-resonant chip U1. The other end of resistor R9 is also connected to pin 3 (COMP) of the quasi-resonant chip U1.

[0021] Optionally, pin 5 OUTPUT of the quasi-resonant chip U1 is connected to the gate of the N-MOS transistor Q1 through resistor R2.

[0022] Optionally, the sampling resistor is a parallel branch consisting of resistors R3 and R6.

[0023] Optionally, the feedback circuit includes resistors R11, R13, R14, and R15, transistors Q1, Q2, and Q3. One end of resistor R11 is connected to the first connection terminal of the first-stage voltage multiplier unit, and the other end of resistor R11 is connected to the base of transistor Q1 and the collector of transistor Q3. The emitter of transistor Q1 is connected to the base of transistor Q2 and the base of transistor Q3. The collector of transistor Q1 is connected to ground GND. The emitter of transistor Q2 is connected to one end of resistor R14, and the emitter of transistor Q3 is connected to one end of resistor R15. The other ends of resistors R14 and R15 are connected to the power supply VIN. The collector of transistor Q2 is connected to one end of resistor R13 and pin FB of the quasi-resonant chip U1. The other end of resistor R3 is connected to ground GND.

[0024] Optionally, the feedback circuit also includes a resistor R12, one end of which is connected to pin 2 FB of the quasi-resonant chip U1, and the other end of which is connected to the digital-to-analog conversion interface of the main control chip.

[0025] Optionally, the specific model of the quasi-resonant chip U1 is LM5022.

[0026] Optionally, it also includes a BGA package structure, in which the BOOST power module and the multi-stage voltage multiplier module are packaged using SIP technology.

[0027] Compared with the prior art, the advantages of this utility model are:

[0028] This invention employs a BOOST power module and a multiplier circuit to construct the negative ignition sustaining power supply for a laser gyroscope. The multiplier output rectifier circuit cleverly utilizes diodes and capacitors for energy storage, thereby achieving a multiplier output. Since no transformer is used in the circuit structure, the BOOST circuit is more efficient than the flyback circuit in applications with higher switching frequencies. The temperature drift caused by the circuit efficiency is significantly lower than that of the flyback circuit, thus ensuring sufficient sustaining voltage while maintaining gyroscope accuracy.

[0029] In addition, the BOOST power supply module has a higher switching frequency than the flyback switching power supply module, which allows for the use of a lower inductor value to obtain a larger peak current. This reduces the size of the inductor, which helps to reduce the size of the circuit. At the same time, the increase in switching frequency can improve the charging and discharging efficiency of the capacitor, thereby reducing the ripple voltage output of the circuit.

[0030] At the same time, due to the addition of a multiplier rectifier circuit, the voltage withstand requirements of the components are greatly reduced compared to a circuit with only a BOOST circuit. Attached Figure Description

[0031] To facilitate understanding of this invention, it will be described in more detail with reference to the specific embodiments shown in the accompanying drawings. These drawings depict only typical embodiments of this invention and should not be considered as limiting the scope of protection of this invention.

[0032] Figure 1 This is a schematic diagram of the circuit structure of the negative ignition sustaining power supply for the laser gyroscope in Embodiment 1 of this utility model.

[0033] Figure 2 This is a schematic diagram of the circuit structure of the voltage multiplier unit of the negative ignition sustaining power supply for the laser gyroscope of this utility model.

[0034] Figure 3 This is a schematic diagram of the BOOST power module and voltage multiplier module of Embodiment 1 of this utility model, which are encapsulated in SIP.

[0035] Figure 4 This is a schematic diagram of the feedback circuit of the negative ignition sustaining power supply for the laser gyroscope in Embodiment 1 of this utility model.

[0036] Figure 5 This is a schematic diagram of the circuit structure of the laser gyroscope power supply in Embodiment 2 of this utility model.

[0037] Figure 6 This is a schematic diagram of the BOOST power module, voltage multiplier module and feedback loop of Embodiment 2 of this utility model, which are encapsulated in SIP. Detailed Implementation

[0038] The embodiments of the present invention are described below with reference to the accompanying drawings, so that those skilled in the art can better understand and implement the present invention. However, the listed embodiments are not intended to limit the present invention. In the absence of conflict, the following embodiments and the technical features in the embodiments can be combined with each other, wherein the same components are indicated by the same reference numerals.

[0039] Example 1:

[0040] This embodiment provides a high-voltage power supply for negative ignition maintenance of a laser gyroscope, which is more efficient, has lower ripple voltage, and is smaller in size than existing flyback switching power supply circuit solutions.

[0041] The principle of this solution is as follows: Figure 1 As shown, 1 is the BOOST power module, 2 is the voltage multiplier module, and the others are peripheral adjustment circuits. In this embodiment, the BOOST power module and voltage multiplier module are integrated into a single 19.00mm × 25.00mm × 5.62mm module using the latest SIP technology. Figure 3 As shown, this results in better efficiency and a smaller size.

[0042] The LM5022, N-MOS transistor, and diode used in this solution are all bare cores, which are attached to the substrate with conductive adhesive. The pins are bonded using gold wire bonding technology with 1mil diameter gold wire. The bonding method is ultrasonic welding, the printing process is laser printing, and the packaging process is plastic encapsulation. The package type is BGA packaging, with a total of 138 pins and 30 effective pins.

[0043] like Figure 2 As shown, the voltage multiplier module includes multiple voltage multiplier units. Each voltage multiplier unit includes a first voltage multiplier diode D01, a second voltage multiplier diode D02, a first voltage multiplier capacitor C01, and a second voltage multiplier capacitor C02. The cathode of the first voltage multiplier diode D01 is connected to one end of the first voltage multiplier capacitor C01, which is the first connection terminal A. The anode of the second voltage multiplier diode D02 is connected to the other end of the first voltage multiplier capacitor C01, which is the second connection terminal B. The second connection terminal B of the previous voltage multiplier unit is connected to the first connection terminal A of the next voltage multiplier unit. The anode of the first voltage multiplier diode D01 is connected to the cathode of the second voltage multiplier diode D02, which is the third connection terminal C. The second voltage multiplier capacitor C02 of the next voltage multiplier unit is located between the third connection terminal of the next voltage multiplier unit and the third connection terminal of the previous voltage multiplier unit.

[0044] The first connection terminal of the first-stage voltage multiplier unit is connected to ground (GND). The second voltage multiplier capacitor (C02) of the first-stage voltage multiplier unit is located between the third connection terminal of the first-stage voltage multiplier unit and the output terminal of the BOOST power module. The second connection terminal of the last-stage voltage multiplier unit forms the output terminal of the voltage multiplier circuit.

[0045] This solution uses the LM5022 chip, which can output a PWM rectangular wave with a higher switching frequency fsw, which helps to reduce the size of the circuit and the ripple voltage.

[0046] This solution consists of a quasi-resonant chip LM5022 and its peripheral circuits, an inductor rectifier and filter circuit, a switching transistor enable circuit, and a feedback loop.

[0047] The power supply is connected to one end of capacitor C21, and the other end of capacitor C21 is connected to ground (GND). Capacitor C21 is a filter capacitor used for filtering the power supply.

[0048] The power supply is connected to pin 1 (VIN) of chip U1 LM5022 to supply power to the chip.

[0049] The power supply is connected to resistor R4, the other end of which is connected to resistor R5. The other end of resistor R5 is connected to ground (GND). The connection between resistors R4 and R5 is connected to pin 7 (UVLO) of chip U1 LM5022. Resistors R4 and R5 divide the power supply voltage to set the voltage value for the chip's UVLO function.

[0050] Pin 10 (SS) of chip U1 LM5022 is connected to ground (GND) through capacitor C23. Pin 10 (SS) is the soft-start switch of the chip. By setting different values ​​of capacitor C23, the startup of chip U1 LM5022 can be controlled.

[0051] The VCC pin of chip U1 LM5022 is connected to ground GND through capacitor C22. The VCC pin is the output terminal of the chip's internal high linearity power supply and must be connected to ground GND through a ceramic capacitor.

[0052] Pin 9 (RT) of chip U1 LM5022 is connected to resistor R1, and the other end of resistor R1 is connected to ground (GND). This is used to adjust the switching frequency (fsw) of the PWM rectangular wave output from pin 5 (OUTPUT) of chip U1 LM5022.

[0053] The OUTPUT pin 5 of chip U1 LM5022 is connected to the gate of N-MOS transistor Q1 through resistor R2, which is used to control the conduction of N-MOS transistor Q1.

[0054] The source of N-MOS transistor Q1 is connected to one end of resistors R3 and R6, and the other end of R3 and R6 is connected to ground (GND). R3 and R6 are connected in parallel. The source of N-MOS transistor Q1 is also connected to one end of resistor R7. The other end of resistor R7 is connected to capacitor C25 and one end of resistor R10. The other end of capacitor C25 is connected to ground (GND). The other end of resistor R10 is connected to pin 8 (CS) of chip U1LM5022. R3 and R6 act as sampling resistors to sample the current flowing through N-MOS transistor Q1. Using two resistors in parallel here increases the current-carrying capacity of the resistors and expands the resistance adjustment range, making it easier to find a resistance value that ensures circuit loop stability during actual debugging. Resistor R7 and capacitor C25 form a low-pass filter to filter out interference spikes generated by the sampling of resistors R3 and R6. The voltage signal across resistors R3 and R6 is input to pin 8 (CS) of the LM5022 via resistor R10, serving as the CS voltage signal input. The CS pin of the LM5022 uses the sampled CS voltage signal to toggle the PWM rectangular wave, thus setting the duty cycle of the PWM rectangular wave. Properly setting the values ​​of resistors R3 and R6 can prevent magnetic saturation of inductor L1.

[0055] The power supply is connected to one end of inductor L1. The other end of inductor L1 is connected to the drain of N-MOS transistor Q1 and one end of capacitor C20. The other end of capacitor C20 is connected to the cathode of diode D19 and the anode of D20. The cathode of D20 is connected to one end of capacitor C14, and the anode of D19 is connected to the other end of capacitor C14. This forms the first stage of the BOOST circuit topology and voltage doubler rectifier circuit. The connection between the anode of diode D19 and capacitor C14 is the output of the first stage. The diode's functions are: 1) to separate the positive and negative half-cycles of the AC input using its unidirectional conductivity, controlling the current direction; 2) to conduct or cut off during a specific half-cycle, guiding current to charge the capacitor or isolating reverse voltage. The capacitor's function is to store charge and maintain voltage stability.

[0056] One end of capacitor C13 is connected to the output of the first stage and the cathode of diode D18, and the other end is connected to the anode of diode D17. The anode of diode D18 is connected to the cathode of diode D17. One end of capacitor C19 is connected to the anode of diode D18 and the cathode of diode D17, and the other end is connected to the anode of diode D20 and the cathode of diode D19. The connection between the anode of diode D17 and capacitor C13 is the output of the second stage. Diodes D17 and D18, and capacitors C13 and C19 constitute the second stage amplification. The function of diode D18 is to conduct during the positive half-cycle of the input, allowing capacitor C19 to charge capacitor C13. The function of diode D17 is to conduct during the negative half-cycle of the input, charging C19 by superimposing the voltage of capacitor C13 with the input voltage. The function of capacitor C13 is to be charged to the peak input voltage during the positive half-cycle, serving as the "base power supply" for subsequent voltage superposition. During the negative half-cycle, capacitor C19 receives the superposition value of capacitor C13 and the input voltage, which is ultimately used as the superposition value of the output capacitor. Similarly, capacitors C1-C20 and diodes D1-D20 constitute a 10x voltage multiplier rectifier circuit. The connection between capacitor C9 and the anode of diode D10 is the output terminal of the last stage of the entire 10x voltage multiplier rectifier circuit. The output voltage of each stage can reach -300V, with the highest output voltage reaching -3000V. Through a feedback circuit, the voltage output range can be controlled within 1500V-3000V. The number of voltage multiplier stages is 5-10, which can provide the ignition voltage for different types of laser gyroscopes.

[0057] The working principle of the negative-starting components: The input voltage is a sine wave with a peak value of Vpeak. The working process alternates between the positive and negative half-cycles of the input voltage. In the first negative half-cycle: Diode D20 conducts, charging capacitor C20 to Vpeak (positive at the bottom, negative at the top). In the first positive half-cycle: Diode D19 conducts, charging capacitor C14 through diode D19 until it is close to Vpeak (positive on the right, negative on the left). In the second negative half-cycle: Diode D18 conducts, charging capacitor C19 through diode D18. According to Kirchhoff's voltage law, the sum of the voltages of capacitors C14 and C19 is zero. In the second positive half-cycle: Diode D17 conducts, charging capacitor C13 through diode D17 until it is charged to Vpeak. The two capacitors are connected in series and superimposed, resulting in a total output of 2Vpeak. This process continues, with subsequent capacitors superimposed to form a voltage multiplier of ten.

[0058] like Figure 4As shown, the feedback circuit includes resistors R11, R13, R14, and R15, transistors Q1, Q2, and Q3. One end of resistor R11 is connected to the first connection terminal of the first-stage voltage multiplier unit. The other end of resistor R11 is connected to the base of transistor Q1 and the collector of transistor Q3. The emitter of transistor Q1 is connected to the base of transistors Q2 and Q3. The collector of transistor Q1 is connected to ground (GND). The emitter of transistor Q2 is connected to one end of resistor R14. The emitter of transistor Q3 is connected to one end of resistor R15. The other ends of resistors R14 and R15 are connected to the power supply VIN. The collector of transistor Q2 is connected to one end of resistor R13 and pin FB of the quasi-resonant chip U1. The other end of resistor R3 is connected to ground (GND).

[0059] In this embodiment, the feedback circuit also includes a resistor R12. One end of the resistor R12 is connected to pin 2 FB of the quasi-resonant chip U1, and the other end of the resistor R12 is connected to the digital-to-analog conversion interface of the main control chip.

[0060] The first stage output terminal of the negative start-up power supply circuit is connected to one end of resistor R11, and FB is connected to the collector of transistor Q2 and one end of resistors R12 and R13. The positive voltage is converted into a negative voltage using the mirror constant current source principle, thereby controlling the voltage value of -UA to control the output voltage.

[0061] The ignition of a laser gyroscope is achieved by ionizing a gas (a helium-neon mixture) into plasma using a high-voltage electric field, thereby generating the inverted particle number distribution required for laser production. Negative ignition specifically refers to applying a high voltage (typically on the order of -3000V) to the cathode, using an electric field to drive electrons to be emitted from the cathode and accelerated towards the anode, inducing gas ionization. After ignition, a stable low voltage (-900V) is required to maintain the plasma and prevent current interruption. Negative sustaining reduces energy loss by lowering the cathode voltage to the operating threshold, while algorithmic control manages the voltage at the output pin, thus switching between ignition and sustaining voltages.

[0062] Pin 2 (FB) of chip U1 LM5022 is connected to one end of capacitor C24 and one end of resistor R9. The other end of capacitor C24 is connected to one end of resistor R8. The other end of resistor R8 is connected to pin 3 (COMP) of chip U1 LM5022. The other end of resistor R9 is also connected to pin 3 (COMP) of chip U1 LM5022.

[0063] The feedback circuit feeds the divided voltage back to pin 2 (FB) of chip U1 LM5022. Pin 2 (FB) is the inverting input of the internal error operational amplifier of chip U1 LM5022, while the non-inverting input is fixed at a constant 1.25V. Pin 3 (COMP) of chip U1 LM5022 is the output of the internal error operational amplifier of chip U1 LM5022. Therefore, resistors R8 and R9, and capacitor C24 form the feedback loop of the operational amplifier, which together constitutes the feedback loop of the power supply. When the output voltage changes, the voltage input to pin FB changes, which in turn changes the voltage at pin 3 (COMP) of chip U1 LM5022. The voltage at pin 3 (COMP) of chip U1 LM5022 is then input to the internal circuitry of chip U1 LM5022, which in turn uses the internal control circuitry to adjust the output PWM rectangular wave, thereby stabilizing the output voltage.

[0064] The LM5022 chip has an extremely high switching frequency. The PWM rectangular wave, as shown in the figure, can have its switching frequency adjusted by setting the value of resistor R1. It operates at 1115kHz. A higher switching frequency in a switching power supply results in lower output ripple. This is further explained by the formula for calculating the inductance L: ,

[0065] In the formula Indicates the input voltage. Indicates the conduction time. This represents the peak current, and D represents the duty cycle. This represents the switching frequency, and L represents the inductance. From the formula, we know that under the same input voltage... Under the condition of duty cycle D, maintain the same peak current. If the switching frequency is increased, a larger peak current can be obtained using a lower inductance value, which can reduce the size of the inductor and thus reduce the size of the circuit.

[0066] In other embodiments, each diode in the multi-stage voltage multiplier module can be composed of two diodes connected in series. The two diodes integrate two functional units into one physical unit, reducing volume, lowering material and manufacturing costs, simplifying design, layout, installation and wiring, sharing heat dissipation, and making the thermal and electrical characteristics more similar.

[0067] Example 2:

[0068] like Figure 5As shown, this embodiment provides a laser gyroscope sustaining power supply. Its circuit structure is basically the same as the laser gyroscope negative ignition high-voltage power supply in Embodiment 1. The difference lies in the number of stages in the voltage multiplier module: 3-5 stages, with each stage outputting a voltage down to -200V, and the highest output voltage reaching -1000V. The voltage output range can be controlled between -600V and -1000V through a feedback circuit, ensuring a stable output voltage for different types of laser gyroscopes. Furthermore, the power supply module, voltage multiplier module, and feedback loop are all packaged in the same chip using SIP technology. Figure 6 As shown; the second difference lies in the structure and principle of the feedback circuit. The structure of feedback circuit 3 is as follows: Figure 4 As shown, the circuit includes resistors R21, R22, R23, and R24, and transistors Q2, Q3, and Q4. The last stage output of the voltage multiplier module is connected to one end of resistor R21. The other end of resistor R21 is connected to one end of resistor R22. The other end of resistor R22 is connected to the collector of transistor Q3 and the base of transistor Q2. The emitter of transistor Q3 is connected to one end of resistor R23. The emitter of transistor Q4 is connected to one end of resistor R24. The other ends of resistors R23 and R24 are connected to the power supply VIN. The bases of transistors Q3 and Q4 are connected to the emitter of transistor Q2. The collector of transistor Q2 is connected to ground (GND), and the collector of transistor Q4 is connected to pin 2 (FB) of the U1LM5022 chip. Unlike the negative starter circuit, because the output voltage is relatively small, the feedback loop is connected to the last stage output of the voltage-doubled module.

[0069] The principle of the feedback loop in the power supply circuit is as follows:

[0070] The output of the negative sustaining power supply circuit is connected to one end of resistor R21, and FB is connected to the collector of transistor Q4. This converts the negative voltage into a positive voltage using the principle of a constant current mirror, feeding the resulting positive voltage back to pin FB of chip U1 LM5022. Pin FB is the inverting input of the internal error operational amplifier of chip U1 LM5022, while the non-inverting input is fixed at a constant 1.25V. Pin 3 COMP of chip U1 LM5022 is the output of the internal error operational amplifier. Therefore, resistors R8 and R9, and capacitor C24 form the feedback loop of the operational amplifier, together constituting the feedback loop of the frequency-stabilized power supply. When the output voltage changes, the voltage input to pin FB changes, which in turn causes a change in the voltage at pin 3 COMP of chip U1 LM5022. The voltage of COMP pin 3 of chip U1 LM5022 is input into the internal circuit of chip U1 LM5022, and then the internal control circuit of the chip is used to adjust the output PWM rectangular wave to stabilize the output voltage.

[0071] The embodiments described above are merely preferred embodiments of this utility model. The terms "in one embodiment," "in another embodiment," "in yet another embodiment," or "in still another embodiment" used in this specification all refer to one or more of the same or different embodiments according to this disclosure. Ordinary variations and substitutions made by those skilled in the art within the scope of this utility model's technical solution should be included within the protection scope of this utility model.

Claims

1. A negative ignition sustaining power supply for a laser gyroscope, characterized in that, include: The system includes a BOOST power module, a multi-stage voltage multiplier module, and a feedback circuit. The multi-stage voltage multiplier module comprises multiple voltage multiplier units. Each voltage multiplier unit includes a first voltage multiplier diode D01, a second voltage multiplier diode D02, and a first voltage multiplier capacitor C01. The cathode of the first voltage multiplier diode D01 is connected to one end of the first voltage multiplier capacitor C01, forming a first connection terminal A. The anode of the second voltage multiplier diode D02 is connected to the other end of the first voltage multiplier capacitor C01, forming a second connection terminal B. The anode of the first voltage multiplier diode D01 is connected to the cathode of the second voltage multiplier diode D02, forming a third connection terminal C. The second connection terminal B of the previous voltage multiplier unit is connected to the first connection terminal A of the next voltage multiplier unit. The first connection terminal of the first-stage voltage multiplier unit is connected to ground (GND), the third connection terminal of the first-stage voltage multiplier unit is connected to the output terminal of the BOOST power module, and the second connection terminal of the last-stage voltage multiplier unit forms the output terminal of the voltage multiplier circuit. The second connection terminal of the Nth stage voltage multiplier unit is connected to the input terminal of the feedback circuit, and the output terminal of the feedback circuit is connected to the feedback terminal of the BOOST power module. The voltage multiplier stage of a negative ignition power supply is 5-10 stages, while the voltage multiplier stage of a negative sustaining power supply is 3-5 stages.

2. The laser gyroscope negative ignition sustaining power supply according to claim 1, characterized in that, Each voltage multiplier unit also includes a second voltage multiplier capacitor C02. The second voltage multiplier capacitor C02 of the next voltage multiplier unit is located between the third connection terminal of the next voltage multiplier unit and the third connection terminal of the previous voltage multiplier unit. The second voltage multiplier capacitor C02 of the first voltage multiplier unit is located between the third connection terminal of the first voltage multiplier unit and the output terminal of the BOOST power module.

3. The laser gyroscope negative ignition sustaining power supply according to claim 2, characterized in that, The BOOST power module includes a quasi-resonant chip U1, an inductor L1, and an N-MOS transistor Q1. The power supply is connected to one end of capacitor C21, the other end of capacitor C21 is connected to ground GND, the power supply is connected to pin 1 VIN of quasi-resonant chip U1, and pin 6 GND of quasi-resonant chip U1 is connected to the circuit ground GND. The power supply is connected to resistor R4, the other end of resistor R4 is connected to one end of resistor R5, the other end of resistor R5 is connected to ground GND, and the connection point of resistors R4 and R5 is connected to pin 7 UVLO of quasi-resonant chip U1. Pin 10 (SS) of the quasi-resonant chip U1 is connected to ground (GND) through capacitor C23, and pin 4 (VCC) of the quasi-resonant chip U1 is connected to ground (GND) through capacitor C22. Pin 9 (RT) of the quasi-resonant chip U1 is connected to resistor R1, and the other end of resistor R1 is connected to ground (GND); pin 5 (OUTPUT) of the quasi-resonant chip U1 is connected to the gate of N-MOS transistor Q1. The power supply is connected to one end of inductor L1, and the other end of inductor L1 is connected to the drain of N-MOS transistor Q1. The connection between the drain of N-MOS transistor Q1 and the inductor L1 forms the output terminal of the power module. The source of N-MOS transistor Q1 is connected to one end of the sampling resistor, and the other end of the sampling resistor is connected to ground GND. The output of the feedback circuit is connected to pin 2 (FB) of the quasi-resonant chip U1.

4. The laser gyroscope negative ignition sustaining power supply according to claim 3, characterized in that, It also includes an RC filter circuit, which consists of resistor R7, capacitor C25, and resistor R10. The source of N-MOS transistor Q1 is also connected to one end of resistor R7. The other end of resistor R7 is connected to one end of capacitor C25 and one end of resistor R10. The other end of capacitor C25 is grounded, and the other end of resistor R10 is connected to pin 8 CS of quasi-resonant chip U1.

5. The laser gyroscope negative ignition sustaining power supply according to claim 3, characterized in that, It also includes a ramp compensation circuit, which consists of capacitor C24, resistor R9, and resistor R8. Pin 2 (FB) of the quasi-resonant chip U1 is connected to one end of capacitor C24 and one end of resistor R9. The other end of capacitor C24 is connected to one end of resistor R8. The other end of resistor R8 is connected to pin 3 (COMP) of the quasi-resonant chip U1. The other end of resistor R9 is also connected to pin 3 (COMP) of the quasi-resonant chip U1.

6. The laser gyroscope negative ignition sustaining power supply according to claim 3, characterized in that, Pin 5 OUTPUT of the quasi-resonant chip U1 is connected to the gate of the N-MOS transistor Q1 through resistor R2.

7. The laser gyroscope negative ignition sustaining power supply according to claim 3, characterized in that, The feedback circuit includes resistors R11, R13, R14, and R15, transistors Q1, Q2, and Q3. One end of resistor R11 is connected to the second connection terminal of the first-stage voltage multiplier unit. The other end of resistor R11 is connected to the base of transistor Q1 and the collector of transistor Q3. The emitter of transistor Q1 is connected to the base of transistors Q2 and Q3. The collector of transistor Q1 is connected to ground (GND). The emitter of transistor Q2 is connected to one end of resistor R14. The emitter of transistor Q3 is connected to one end of resistor R15. The other ends of resistors R14 and R15 are connected to the power supply VIN. The collector of transistor Q2 is connected to one end of resistor R13 and pin FB of the quasi-resonant chip U1. The other end of resistor R3 is connected to ground (GND).

8. The laser gyroscope negative ignition sustaining power supply according to claim 7, characterized in that, The feedback circuit also includes resistor R12. One end of resistor R12 is connected to pin 2 FB of quasi-resonant chip U1, and the other end of resistor R12 is connected to the digital-to-analog conversion interface of the main control chip.

9. The laser gyroscope negative ignition sustaining power supply according to claim 3, characterized in that, The specific model of the quasi-resonant chip U1 is LM5022.

10. The laser gyroscope negative ignition sustaining power supply according to any one of claims 1-9, characterized in that, It also includes a BGA package structure, in which the BOOST power module and the multi-stage voltage multiplier module are packaged using SIP technology.

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