A starting surge current suppression circuit suitable for super large energy storage capacitor

Abstract

The application provides a starting surge current suppression circuit suitable for super large energy storage capacitor, comprising MCU control circuit, surge suppression circuit and laser driver circuit connected in sequence, wherein the surge suppression circuit is innovative and prominent, the surge suppression circuit has multiple current limiting channels independently arranged and controlled by the MCU control circuit, and is used for charging the super large energy storage capacitor; the MCU control circuit is the core of the whole circuit, is used for collecting voltage information fed back by the voltage feedback circuit, and controls the action of the surge suppression circuit according to the voltage information, so as to reduce the surge suppression current; the super large energy storage capacitor greatly reduces the peak power requirement of the power supply equipment when starting to work through the circuit of the application, and the power supply current is stable when charging the capacitor, so that the instantaneous interference on other module circuits is avoided, and in addition, the average power consumption can be reduced under the condition of meeting high frequency driving.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of laser measurement and illumination, and particularly relates to a starting surge current suppression circuit suitable for a super large energy storage capacitor. BACKGROUND

[0002] The working principle of the laser driver of the laser measurement and illumination is that the laser used for measurement and illumination needs hundreds of amperes of current at the instant of light emission, and a general power supply or battery can only provide several amperes or tens of amperes of current, so it is not feasible to drive the laser completely by relying on the instantaneous power provided by the power supply. The mature technology at present is to use a large-capacity capacitor to store energy, and to discharge the energy stored in the large capacitor to drive the laser at the instant of light emission, and the power supply only provides current as an auxiliary, so as to reduce the requirement on the power supply equipment. However, when the large energy storage capacitor is charged, a huge surge current is generated at the first start, and the current can cause certain interference to the power supply equipment and the power supply module.

[0003] The reason for the above phenomenon is that, generally, before the circuit starts, the capacitor is not storing energy, that is, the positive and negative electrode voltage difference is zero. After starting, the initial positive and negative electrode voltage difference is the charging voltage, and the ESR of the capacitor is relatively small, at this time, a huge surge current will be generated, which can cause abnormality of the power supply equipment and damage to the power supply system. When the starting current is suppressed, the stability of the measurement and illumination laser under high frequency working should also be considered. SUMMARY

[0004] In view of the fact that the existing driving circuit generates a large surge current when powered on, and the general non-high-power power supply equipment cannot be normally driven, the purpose of the present application is to provide a starting surge current suppression circuit suitable for a super large energy storage capacitor.

[0005] In order to achieve the above purpose, the technical solution adopted by the present application is that a starting surge current suppression circuit suitable for a super large energy storage capacitor comprises an MCU control circuit, a surge suppression circuit, a voltage feedback circuit and a laser driver circuit, the MCU control circuit, the surge suppression circuit and the laser driver circuit are connected in sequence, and the control end of the laser driver circuit is also directly connected with the output end of the MCU control circuit, and the surge suppression circuit is also connected with the input end of the MCU control circuit through the voltage feedback circuit.

[0006] The voltage feedback circuit is used for monitoring the voltage between the two ends of the super large energy storage capacitor, and the size of the monitored voltage is fed back to the MCU control circuit as voltage information.

[0007] The MCU control circuit is used for collecting the voltage information fed back by the voltage feedback circuit and controlling the action of the surge suppression circuit according to the voltage information.

[0008] The surge suppression circuit has multiple current limiting channels which are independently set and controlled by the MCU control circuit, and are used for charging the super large energy storage capacitor.

[0009] The MCU control circuit is also used for controlling the working state of the laser driver circuit, and when the laser driver circuit starts to work, the super large energy storage capacitor and the laser driver circuit jointly drive the laser to work.

[0010] Further, the MCU minimum system adopts an STM32 series single-chip microcomputer.

[0011] Further, the 7th pin of the MCU minimum system is a reset port, and the 1st pin of the MCU minimum system is a U1 output.

[0012] Further, the 10th pin of the MCU minimum system is directly connected to the laser driver circuit, the 11th pin is connected to the voltage feedback circuit, and the 12th, 13th and 18th pins are respectively connected to corresponding current limiting channels.

[0013] Further, the current limiting resistances of the multiple current limiting channels are different.

[0014] Further, each current limiting channel comprises an NPN triode, a drain-source resistance, a current limiting diode and a current limiting resistance, wherein the base of the NPN triode is connected to the MCU minimum system, the emitter is grounded, the collector is respectively connected to the gate and the source of the drain-source resistance, the source is connected to a power supply voltage, the drain of the drain-source resistance is connected to the positive plate of the super large energy storage capacitor through the current limiting diode and the current limiting resistance in sequence, the positive plate of the super large energy storage capacitor is also connected to the voltage feedback circuit, and the positive electrode of the current limiting diode is connected to the drain of the drain-source resistance.

[0015] Further, the current limiting channels are three, and the bases of the NPN triodes in the three current limiting channels are respectively connected to the 12th, 13th and 18th pins of the MCU minimum system.

[0016] Further, the voltage feedback circuit comprises an operational amplifier U2, a resistance R13 and a resistance R14, the 1st and 4th pins of the operational amplifier U2 are connected, the 1st pin is also connected to the 11th pin of the MCU minimum system, the 2nd pin is grounded, the 5th pin is connected to a +3.3V power supply voltage, the 3rd pin is connected to the positive plate of the super large energy storage capacitor through the resistance R13, and the 3rd pin is also grounded through the resistance R14.

[0017] Further, the laser driver circuit comprises a driving chip U3, a light emitting diode LD1 and a MOS tube N1, the 4th pin and the 5th pin of the driving chip U3 are grounded, the 6th pin is connected to the 10th pin of the minimum system of the MCU, the 1st pin is connected to the driving power supply voltage, the 2nd pin and the 3rd pin are respectively connected to a resistor and then commonly connected to the gate of the MOS tube N1, the source of the MOS tube N1 is grounded, the drain is connected to the negative electrode of the light emitting diode LD1, and the positive electrode of the light emitting diode LD1 is connected to the positive plate of the super large energy storage capacitor.

[0018] Further, the driving power supply voltage is 15V.

[0019] Compared with the prior art, the application has the beneficial effects that: the application is a kind of suppression starting surge current circuit suitable for super large energy storage capacitor, comprising MCU control circuit, surge suppression circuit and laser driver circuit connected in sequence, and the control end of the laser driver circuit is also directly connected with the output end of the MCU control circuit, and the surge suppression circuit is also connected with the input end of the MCU control circuit through the voltage feedback circuit, wherein the surge suppression circuit is innovative, and the surge suppression circuit has a plurality of current limiting channels independently arranged and controlled by the MCU control circuit, for charging the super large energy storage capacitor, the MCU control circuit is the core of the whole circuit, for collecting voltage information fed back by the voltage feedback circuit and controlling the surge suppression circuit to act according to the voltage information, so as to reduce the surge suppression current;The super large energy storage capacitor greatly reduces the peak power requirement of the power supply equipment when starting to work, and the power supply current is stable when charging the capacitor, which will not cause instantaneous interference to other module circuits, and the method can also reduce the average power consumption under the condition of meeting high frequency driving. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the principle diagram of the application;

[0021] Figure 2 is the circuit diagram of MCU control circuit;

[0022] Figure 3 is the circuit diagram of surge suppression circuit;

[0023] Figure 4 is the circuit diagram of voltage feedback circuit;

[0024] Figure 5 is the circuit diagram of laser driver circuit. DETAILED DESCRIPTION

[0025] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0026] A starting surge current suppression circuit suitable for a super large energy storage capacitor, comprising an MCU control circuit, a surge suppression circuit, a voltage feedback circuit and a laser driver circuit, the MCU control circuit, the surge suppression circuit and the laser driver circuit are connected in sequence, and the control end of the laser driver circuit is directly connected with the output end of the MCU control circuit, and the surge suppression circuit is connected with the input end of the MCU control circuit through the voltage feedback circuit;

[0027] The voltage feedback circuit is used for monitoring the voltage across the super large energy storage capacitor, and feeding back the size of the monitored voltage as voltage information to the MCU control circuit.

[0028] The MCU control circuit is the core of the whole circuit, which is used for collecting the voltage information fed back by the voltage feedback circuit and controlling the surge suppression circuit to act according to the voltage information, so as to reduce the surge suppression current.

[0029] The surge suppression circuit has a plurality of current limiting channels which are independently set and controlled by the MCU control circuit, and is used for charging the super large energy storage capacitor.

[0030] The laser driver circuit provides a large current for the laser, and drives the laser to emit light.

[0031] The MCU control circuit is also used for controlling the working state of the laser driver circuit, when the laser driver circuit starts to work, the super large energy storage capacitor and the laser driver circuit jointly drive the laser to work.

[0032] As shown in Figure 2 The MCU minimum system adopts an STM32 series single-chip microcomputer, and the specific model is STM32F101CBT6. The 7th pin of the MCU minimum system is a reset port, and the 1st pin of the MCU minimum system is a U1 output. The 10th pin of the MCU minimum system is directly connected to the laser driver circuit, the 11th pin is connected to the voltage feedback circuit, and the 12th pin, the 13th pin and the 18th pin are respectively connected to the corresponding current limiting channels.

[0033] As shown in Figure 3As shown, the surge suppression circuit has three current-limiting channels. The bases of the NPN transistors in these channels are connected to pins 12, 13, and 18 of the MCU minimum system, respectively. Each current-limiting channel includes an NPN transistor, a drain-source resistor, a current-limiting diode, and a current-limiting resistor. The base of the NPN transistor is connected to the MCU minimum system, the emitter is grounded, and the collector is connected to the gate and source of the drain-source resistor. For optimal performance, a 10KΩ resistor R11 is connected in series between the gate and source, and the source is connected to the supply voltage VCC. The drain of the drain-source resistor is connected to the positive plate of the large energy storage capacitor via the current-limiting diode and the current-limiting resistor. The positive plate of the large energy storage capacitor is also connected to the voltage feedback circuit. The anode of the current-limiting diode is connected to the drain of the drain-source resistor. In this embodiment, the drain-source resistor is a SI7119DN.

[0034] Furthermore, the current limiting resistance values ​​of the multiple current limiting channels are different. In this embodiment, the current limiting resistances in the three current limiting channels are 20R, 10R and 5R, respectively.

[0035] like Figure 4 As shown, the voltage feedback circuit includes operational amplifier U2, resistor R13 and resistor R14. Pin 1 and pin 4 of operational amplifier U2 are connected, and pin 1 is also connected to pin 11 of the MCU minimum system. Pin 2 is grounded, pin 5 is connected to the +3.3V power supply voltage, and pin 3 is connected to the positive plate of the large energy storage capacitor through resistor R13. Pin 3 is also grounded through resistor R14.

[0036] like Figure 5 As shown, the laser driving circuit includes a driver chip U3, a light-emitting diode LD1, and a MOSFET N1. Pins 4 and 5 of the driver chip U3 are grounded, pin 6 is connected to pin 10 of the MCU minimum system, pin 1 is connected to the driving power supply voltage, and pins 2 and 3 are each connected to a resistor and then together connected to the gate of the MOSFET N1. The source of the MOSFET N1 is grounded, and its drain is connected to the negative terminal of the light-emitting diode LD1. The positive terminal of the light-emitting diode LD1 is connected to the positive plate of the large energy storage capacitor. The driving power supply voltage is 15V.

[0037] Example 1

[0038] The working state of the surge suppression circuit is described in this embodiment: when the laser driver circuit is powered on, the super large energy storage capacitor is first charged, and the energy storage is performed after the other modules and the charged power module are stable. The initial voltage difference is large, and only the current limiting channel of Q1 can be turned on for charging. When the voltage feedback circuit monitors that the voltage of the capacitor reaches a certain value, the current limiting channel of Q2 can be turned on for charging. When other set values are reached, the current limiting channel of Q3 is turned on for charging. Because the current limiting resistors of each channel are different, the input current of the power supply device can be stabilized within a certain range according to different set values. In addition, if accurate control is required, the number of channels can be increased to set different current limiting resistors, and multiple channels can be selected to be turned on at the same time. The stability of the input current during the charging of the super large energy storage capacitor is also ensured, and the stability of the power module is also ensured.

[0039] The surge suppression circuit in the application has multiple independent current limiting channels set and controlled by the MCU control circuit, which is used to charge the super large energy storage capacitor. The MCU control circuit is the core of the entire circuit, which is used to collect voltage information fed back by the voltage feedback circuit and control the action of the surge suppression circuit according to the voltage information to reduce the surge suppression current. The super large energy storage capacitor greatly reduces the peak power requirement of the power supply device when starting to work, and the power supply current is stable when charging the capacitor, which will not cause instantaneous interference to other module circuits. In addition, this method can also reduce the average power consumption under the condition of high frequency driving.

[0040] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the application. Therefore, the application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A starting surge current suppression circuit suitable for super large energy storage capacitor, comprising an MCU control circuit, characterized in that: The surge suppression circuit, the voltage feedback circuit and the laser driver circuit are sequentially connected, and the control end of the laser driver circuit is also directly connected with the output end of the MCU control circuit; the surge suppression circuit is also connected with the input end of the MCU control circuit through the voltage feedback circuit; The voltage feedback circuit is used for monitoring the voltage across the super large energy storage capacitor and feeding back the size of the monitored voltage as voltage information to the MCU control circuit; The MCU control circuit is used for collecting the voltage information fed back by the voltage feedback circuit and controlling the surge suppression circuit to act according to the voltage information; The surge suppression circuit has a plurality of current limiting channels which are independently set and controlled by the MCU control circuit and are used for charging the super large energy storage capacitor; The MCU control circuit is also used for controlling the working state of the laser driver circuit, and when the laser driver circuit starts to work, the super large energy storage capacitor and the laser driver circuit jointly drive the laser to work; the current limiting resistances of the plurality of current limiting channels are different; each current limiting channel comprises an NPN triode, a drain-source resistance, a current limiting diode and a current limiting resistance, wherein the base of the NPN triode is connected to the MCU minimum system, the emitter is grounded, the collector is connected to the gate and the source of the drain-source resistance respectively, the source is connected to the power supply voltage, the drain of the drain-source resistance is connected to the positive plate of the super large energy storage capacitor through the current limiting diode and the current limiting resistance in sequence, the positive plate of the super large energy storage capacitor is also connected to the voltage feedback circuit, and the positive pole of the current limiting diode is connected to the drain of the drain-source resistance.

2. A start-up inrush current suppressing circuit suitable for use with an ultra-large energy storage capacitor according to claim 1, characterized in that: The MCU minimum system adopts an STM32 series single-chip microcomputer.

3. A start-up inrush current suppression circuit suitable for use with an ultra-large energy storage capacitor according to claim 2, wherein: The 7th pin of the MCU minimum system is a reset port, and the 1st pin of the MCU minimum system is a U1 output.

4. A start-up inrush current suppression circuit suitable for use with an ultra-large energy storage capacitor according to claim 2, wherein: The 10th pin of the MCU minimum system is directly connected to the laser driver circuit, the 11th pin is connected to the voltage feedback circuit, and the 12th, 13th and 18th pins are connected to corresponding current limiting channels.

5. A start-up inrush current suppression circuit suitable for use with an ultra-large energy storage capacitor as defined in claim 1, wherein: The current limiting channels are three, and the bases of the NPN triodes in the three current limiting channels are connected to the 12th, 13th and 18th pins of the MCU minimum system respectively.

6. A start-up inrush current suppression circuit suitable for use with an ultra-large energy storage capacitor according to claim 5, wherein: The voltage feedback circuit comprises an operational amplifier U2, a resistor R13 and a resistor R14, the 1st pin and the 4th pin of the operational amplifier U2 are connected, the 1st pin is also connected to the 11th pin of the MCU minimum system, the 2nd pin is grounded, the 5th pin is connected to a +3.3V power supply voltage, the 3rd pin is connected to the positive plate of the super large energy storage capacitor through the resistor R13, and the 3rd pin is also grounded through the resistor R14.

7. A start-up inrush current suppression circuit suitable for use with an ultra-large energy storage capacitor as defined in claim 4, wherein: The laser driver circuit comprises a drive chip U3, a light emitting diode LD1 and a MOS tube N1, the 4th pin and the 5th pin of the drive chip U3 are grounded, the 6th pin is connected to the 10th pin of the MCU minimum system, the 1st pin is connected to a drive power supply voltage, the 2nd pin and the 3rd pin are respectively connected to a resistor and then are commonly connected to the gate of the MOS tube N1, the source of the MOS tube N1 is grounded, the drain is connected to the negative pole of the light emitting diode LD1, and the positive pole of the light emitting diode LD1 is connected to the positive plate of the super large energy storage capacitor.

8. A start-up inrush current suppression circuit suitable for use with an ultra-large energy storage capacitor according to claim 7, wherein: The drive power supply voltage is 15V.

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