A flash control circuit and method based on dual energy storage units

Abstract

This invention discloses a flash control circuit and method based on dual energy storage units, relating to the field of flash control. The invention constructs a dual energy storage architecture supporting dynamic charging scheduling by setting up a first charging branch composed of a first isolation diode and a first energy storage unit, and a second charging branch composed of a second isolation diode and a second energy storage unit, and connecting them in parallel to the output of the same boost unit. Since the two energy storage units are electrically connected to the boost output through isolation diodes, when one energy storage unit discharges through the lamp unit to generate flash, the other energy storage unit still maintains a charging path with the boost unit, thus enabling immediate energy replenishment. During periods when neither energy storage unit is discharging, both are connected to the boost unit, thus possessing parallel charging capability. This effectively eliminates the bottleneck of waiting for a complete recharge cycle after discharge, as required by single-capacitor solutions.

Description

Technical Field

[0001] This invention relates to the field of flash control, and more particularly to a flash control circuit and method based on dual energy storage units. Background Technology

[0002] In security monitoring and traffic checkpoint capture systems, xenon strobe lights are key light source components, and their performance directly determines the clarity, brightness consistency, and recognition accuracy of images in nighttime or low-light environments. With the continuous improvement of continuous shooting capabilities of high-definition high-speed cameras, higher demands are placed on the response speed and repetition frequency of the fill lights, especially the need to complete continuous strobe flashes within extremely short time intervals to match the camera's high-speed continuous shooting rhythm. However, existing xenon strobe light systems are limited by the charging (i.e., "recharge") time of the energy storage capacitor, making it difficult to overcome the physical recharge limit. If the continuous shooting interval set by the camera is less than the time required for the capacitor to complete charging, the energy of the subsequent strobe flash will be insufficient, resulting in uneven brightness and significant exposure differences between consecutive frames, severely affecting the capture quality and algorithm recognition effect.

[0003] Currently, the mainstream technical solutions in the industry are mainly divided into two categories: one is a single-channel charging architecture, which only configures one charging circuit to charge a single energy storage capacitor bank. The structure is simple, but it is limited by the capacitor's recharge cycle and cannot support continuous flashing with a time shorter than the recharge time. The other is a dual-channel independent architecture, which uses two completely independent charging circuits, control circuits, and xenon lamps to work separately, achieving alternating flashing to shorten the effective continuous shooting interval. Although it can partially meet the needs of high-speed continuous shooting, this solution requires twice the number of components, resulting in a complex PCB layout, increased overall size, increased power consumption, and significantly increased material and production costs. It is difficult to adapt to the current development trend of miniaturization, cost reduction, and high integration of equipment.

[0004] More importantly, in practical engineering applications, terminal devices are often limited by fixed installation space and power supply capacity, making it impossible to improve performance by adding independent charging power supplies or xenon lamps. Therefore, there is an urgent need for a control scheme that can overcome the capacitor return time limitation and achieve ultra-short interval continuous flashing without adding independent charging circuits, xenon lamps, or significantly modifying the original hardware platform, simply by optimizing the circuit topology and control logic. Summary of the Invention

[0005] To overcome the single-capacitor recycle time limitation and achieve ultra-short interval continuous strobe without adding a separate charging circuit and xenon lamp, this invention proposes a flash control circuit based on dual energy storage units, comprising: The system comprises a boost unit, a first energy storage unit, a second energy storage unit, a first isolation diode, a second isolation diode, a first switching unit, a second switching unit, a lamp control unit, and a lamp unit, wherein: The boost unit is used to convert the input DC voltage into a high DC voltage; The first isolation diode and the first energy storage unit form a first charging branch, and the second isolation diode and the second energy storage unit form a second charging branch; the first charging branch and the second charging branch are connected in parallel to the output terminal of the boost unit to receive the DC high voltage; wherein, the conduction direction of each isolation diode is towards the corresponding energy storage unit; The first switching unit is connected in series between the first energy storage unit and the lamp unit to form a first discharge circuit; the second switching unit is connected in series between the second energy storage unit and the lamp unit to form a second discharge circuit. The lamp control unit is connected to the control terminals of the first switch unit and the second switch unit. It is used to respond to an external trigger signal and alternately turn on the first switch unit and the second switch unit in a preset order so that the first energy storage unit and the second energy storage unit alternately discharge through the lamp unit.

[0006] Furthermore, the lamp control unit includes a counter configured to count external trigger signals; when the count value is odd, the first switching unit is turned on; when the count value is even, the second switching unit is turned on.

[0007] Furthermore, the boost unit includes: a first inductor, a boost controller, a third switching transistor, a third isolation diode, and a third capacitor; wherein: The input terminal of the first inductor is used to connect to the input DC voltage; The drain of the third switching transistor is connected to the output terminal of the first inductor, and the source is connected to the ground terminal; The control terminal of the boost controller is connected to the gate of the third switch transistor and is used to output a pulse width modulation signal to control the on / off state of the third switch transistor. The anode of the third isolation diode is connected to the output terminal of the first inductor, and the cathode constitutes the output terminal of the boost unit; The third capacitor is connected between the output terminal of the boost unit and the ground terminal to store electrical energy and maintain the DC high voltage at the output terminal of the boost unit.

[0008] Furthermore, the first energy storage unit includes a first capacitor; The cathode of the first isolation diode is connected to the positive terminal of the first capacitor, and the anode is connected to the output terminal of the boost unit.

[0009] Furthermore, the second energy storage unit includes a second capacitor; The cathode of the second isolation diode is connected to the positive terminal of the second capacitor, and the anode is connected to the output terminal of the boost unit.

[0010] Furthermore, the first switching unit includes a first isolation driver and a first IGBT transistor; wherein: The collector of the first IGBT is connected to the positive terminal of the first capacitor, and the emitter is connected to the positive terminal of the lamp unit; The signal input terminal of the first isolation driver is connected to the lamp control unit, the signal output terminal is connected to the gate of the first IGBT, and the reference terminal of the first isolation driver is connected to the emitter of the first IGBT.

[0011] Furthermore, the second switching unit includes a second isolation driver and a second IGBT transistor; wherein: The collector of the second IGBT is connected to the positive terminal of the second capacitor, and the emitter is connected to the positive terminal of the lamp unit; The signal input terminal of the second isolation driver is connected to the lamp control unit, the signal output terminal of the second isolation driver is connected to the gate of the second IGBT, and the reference terminal of the second isolation driver is connected to the emitter of the second IGBT.

[0012] Furthermore, the lamp unit includes a target lamp, a trigger, and a coil control unit; wherein: The target lamp has a positive terminal and a negative terminal. The positive terminal of the target lamp constitutes the positive terminal of the lamp unit and is simultaneously connected to the emitters of the first IGBT and the second IGBT. The negative terminal of the target lamp is grounded. The output of the trigger is connected to the trigger electrode of the target lamp tube; The coil control unit is connected to the trigger and is used to control the trigger to generate a high-voltage pulse to turn on the target lamp when it receives the control signal output by the lamp control unit.

[0013] Furthermore, the target lamp tube is a xenon flash lamp tube, a krypton flash lamp tube, or a flash lamp tube containing a mixture of xenon and krypton.

[0014] To address the aforementioned technical problems, this invention also proposes a flash control method based on dual energy storage units, applied to the flash control circuit described above, comprising: Receive external trigger signals; In response to each received external trigger signal, perform the following operations: Send a control signal to the coil control unit to drive the trigger to generate a high voltage pulse, causing the gas inside the target lamp tube to break down and enter the conduction state; According to a preset sequence, a conduction signal is sent to the first or second switching unit, causing the corresponding energy storage unit to discharge through the target lamp tube that is already in the conduction state, so as to generate a flash.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects:

[0016] (1) This invention constructs a dual-energy storage architecture that supports dynamic charging scheduling by setting up a first charging branch consisting of a first isolation diode and a first energy storage unit, and a second charging branch consisting of a second isolation diode and a second energy storage unit, and connecting them in parallel to the output terminal of the same boost unit. This is achieved without adding an independent charging circuit (i.e., without adding an additional boost unit). Since the two energy storage units are electrically connected to the boost output terminal through isolation diodes, when one energy storage unit discharges through the lamp unit to generate flashes, the other energy storage unit still maintains a charging path with the boost unit, thus enabling immediate energy replenishment. During periods when neither energy storage unit is discharging, both are connected to the boost unit, thus enabling parallel charging. This mechanism effectively eliminates the bottleneck of waiting for a complete recharge cycle after discharge in the single-capacitor scheme, significantly shortens the time interval of continuous flashes, and improves the overall energy utilization efficiency of the system.

[0017] (2) The present invention responds to external trigger signals by lamp control unit and alternately turns on the first switch unit and the second switch unit in a preset order, so that the first energy storage unit and the second energy storage unit discharge to the same lamp unit in turn. Only a single lamp unit is needed to support continuous high-frequency flashing, avoiding the need to add extra lamps to increase the flashing frequency, thereby saving hardware space and cost.

[0018] (3) In this invention, the entire circuit relies on a single boost unit to provide DC high voltage without introducing an additional boost unit or independent charging power supply. Combined with dual energy storage units and alternating discharge control logic, the flash unit achieves ultra-short interval continuous shooting capability without significantly altering the original hardware platform. It is suitable for terminal devices that are sensitive to size, power consumption and cost. Attached Figure Description

[0019] Figure 1 This is a flash control circuit diagram based on a dual energy storage unit in an embodiment of the present invention. Detailed Implementation

[0020] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of the present invention. However, the present invention is not limited to these embodiments.

[0021] To overcome the single-capacitor recycle time limitation and achieve ultra-short interval continuous flashing without adding a separate charging circuit and xenon lamps, such as Figure 1As shown, this invention proposes a flash control circuit based on a dual energy storage unit, comprising: The system comprises a boost unit, a first energy storage unit, a second energy storage unit, a first isolation diode D1, a second isolation diode D2, a first switching unit, a second switching unit, a lamp control unit, and a lamp unit, wherein: The boost unit is used to convert the input DC voltage into a high DC voltage; The boost unit includes: a first inductor L1, a boost controller, a third switching transistor Q3, a third isolation diode D3, and a third capacitor C3; wherein: The input terminal of the first inductor L1 is used to connect to the input DC voltage; The drain of the third switch Q3 is connected to the output terminal of the first inductor L1, and the source is connected to the ground terminal; The control terminal of the boost controller is connected to the gate of the third switch Q3 and is used to output a pulse width modulation signal to control the on / off state of the third switch Q3. The anode of the third isolation diode D3 is connected to the output terminal of the first inductor L1, and the cathode constitutes the output terminal of the boost unit; The third capacitor C3 is connected between the output terminal and the ground terminal of the boost unit, and is used to store electrical energy and maintain the DC high voltage at the output terminal of the boost unit.

[0022] Figure 1 middle: CON1: This is the DC power input interface, used to connect to an external DC voltage (such as a battery, a high-power adapter, or an industrial DC power supply). Its positive and negative terminals are connected to the input terminal of the boost unit and the ground terminal (i.e., system ground), respectively. VBUS, VB1, and VB2 are used to identify the voltages at the output node of the boost unit, the positive terminal of the first capacitor C1, and the positive terminal of the second capacitor C2, respectively.

[0023] In this invention, the entire circuit relies on a single boost unit to provide DC high voltage without introducing additional boost units or independent charging power supplies. Combined with dual energy storage units and alternating discharge control logic, the flash unit achieves ultra-short interval continuous shooting capability without significantly altering the original hardware platform, making it suitable for terminal devices that are sensitive to size, power consumption, and cost.

[0024] In this embodiment, the charging process of the third capacitor C3 is as follows: When the boost controller outputs a PWM signal to turn on the third switch Q3, the input DC voltage forms a loop through the first inductor L1 and Q3, and the current flows through L1, storing magnetic energy. During this stage, the output terminal of L1 is pulled down to near ground potential by Q3, causing the anode potential of the third isolation diode D3 to be lower than its cathode potential, and D3 is thus in a reverse cutoff state; at this time, C3 only relies on its own stored charge to power the first and second energy storage units in the subsequent stage.

[0025] When Q3 is turned off, the magnetic energy stored in L1 is released. Its induced electromotive force is superimposed on the input DC voltage, causing the output potential of L1 to rise rapidly. When this potential is higher than the cathode potential of D3, D3 is forward-biased. The input voltage and L1 together charge the third capacitor C3 through D3, while C3 continuously provides the energy required for charging the first and second energy storage units in the subsequent stage.

[0026] As the charge-discharge cycle continues, the voltage across C3 gradually rises and stabilizes, thereby establishing and maintaining a DC high voltage higher than the input voltage at the output of the boost unit, providing a stable high-voltage power supply for the subsequent alternating charge and discharge of the dual energy storage units.

[0027] The first isolation diode D1 and the first energy storage unit form a first charging branch, and the second isolation diode D2 and the second energy storage unit form a second charging branch; the first charging branch and the second charging branch are connected in parallel to the output terminal of the boost unit to receive the DC high voltage; wherein, the conduction direction of each isolation diode is towards the corresponding energy storage unit; It should be noted that, thanks to the unidirectional conduction characteristic of diodes, when any energy storage unit is discharging, its voltage drop will not be reverse-conducted to the output terminal of the boost unit through the corresponding isolation diode, thereby avoiding transient voltage interference to the charging process of the other energy storage unit and ensuring the electrical independence of dual-path charging.

[0028] The first energy storage unit includes a first capacitor C1; The cathode of the first isolation diode D1 is connected to the positive terminal of the first capacitor C1, and the anode is connected to the output terminal of the boost unit.

[0029] The second energy storage unit includes a second capacitor C2; The cathode of the second isolation diode D2 is connected to the positive terminal of the second capacitor C2, and the anode is connected to the output terminal of the boost unit.

[0030] The first switching unit is connected in series between the first energy storage unit and the lamp unit to form a first discharge circuit; the second switching unit is connected in series between the second energy storage unit and the lamp unit to form a second discharge circuit. The first switching unit includes a first isolation driver and a first IGBT transistor Q1; wherein: The collector of the first IGBT Q1 is connected to the positive terminal of the first capacitor C1, and the emitter is connected to the positive terminal of the lamp unit; The signal input terminal of the first isolation driver is connected to the lamp control unit, the signal output terminal is connected to the gate of the first IGBT Q1, and the reference terminal of the first isolation driver is connected to the emitter of the first IGBT Q1.

[0031] The second switching unit includes a second isolation driver and a second IGBT transistor Q2; wherein: The collector of the second IGBT Q2 is connected to the positive terminal of the second capacitor C2, and the emitter is connected to the positive terminal of the lamp unit; The signal input terminal of the second isolation driver is connected to the lamp control unit, the signal output terminal of the second isolation driver is connected to the gate of the second IGBT Q2, and the reference terminal of the second isolation driver is connected to the emitter of the second IGBT Q2.

[0032] The first isolation drive and the second isolation drive refer to gate drive circuits with electrical isolation function, which are used to safely transmit the low-voltage side switch control signal from the lamp control unit to the gates of the first IGBT Q1 and the second IGBT Q2 located on the high-voltage floating side, while blocking the DC path between the low-voltage control terminal and the high-voltage power terminal to achieve electrical isolation between the two.

[0033] The lamp control unit is connected to the control terminals of the first switch unit and the second switch unit, and is used to respond to an external trigger signal and alternately turn on the first switch unit and the second switch unit in a preset order so that the first energy storage unit and the second energy storage unit alternately discharge through the lamp unit. The lamp control unit includes a counter configured to count external trigger signals; when the count value is odd, the first switching unit is turned on; when the count value is even, the second switching unit is turned on.

[0034] The lamp unit includes a target lamp, a trigger (a 10KV trigger in this embodiment), and a coil control unit; wherein: The target lamp has a positive terminal and a negative terminal. The positive terminal of the target lamp constitutes the positive terminal of the lamp unit and is simultaneously connected to the emitters of the first IGBT Q1 and the second IGBT Q2. The negative terminal of the target lamp is grounded. The output of the trigger is connected to the trigger electrode of the target lamp tube; The coil control unit is connected to the trigger and is used to control the trigger to generate a high-voltage pulse to turn on the target lamp when it receives the control signal output by the lamp control unit.

[0035] The target lamp is a xenon flash lamp, a krypton flash lamp, or a flash lamp containing a mixture of xenon and krypton.

[0036] In this embodiment, the target lamp tube is Figure 1 The xenon flash tube FL1 shown is shown.

[0037] It should be noted that the trigger (specifically, a "10kV trigger" in this embodiment) is a high-voltage pulse generator. After receiving the drive signal from the coil control unit, it generates a trigger pulse with an amplitude of about 10kV and a width in the microsecond range at its output terminal, which is applied to the trigger electrode of the xenon flash tube FL1, causing the gas inside the tube to break down and enter the conduction state. Coil control unit: Connected between the lamp tube control unit and the trigger, it is used to receive the flash enable signal output by the lamp tube control unit, and generate a drive pulse with a width of several microseconds each time the signal is received, so as to drive the trigger, so that it generates a high voltage trigger pulse at its output terminal and applies it to the trigger electrode of the target lamp tube to achieve gas breakdown and conduction.

[0038] In this embodiment, the first energy storage unit and the second energy storage unit are connected in parallel to the output of the boost unit via their respective isolation diodes. The lamp control unit is equipped with interlocking logic to ensure that the first IGBT Q1 and the second IGBT Q2 are never turned on simultaneously. Under this control, they alternately discharge to the same lamp unit in response to an external trigger signal.

[0039] The circuit of this invention can be used in multiple application scenarios, including: 1. Application Scenario 1: Alternating strobe triggered by high-frequency continuous single pulse (increasing the average flash frequency) In scenarios where external trigger signals are continuously input at fixed time intervals T (e.g., continuous frame exposure in high-speed photography), this invention significantly improves the upper limit of the flash frequency that the system can support by alternating operation of dual energy storage units.

[0040] Assume that after a single energy storage unit is fully discharged, it takes 60ms to recharge to the effective flash voltage (i.e., the minimum capacitor voltage required to ensure the target lamp flashes normally, such as 580V). In traditional single-capacitor flash circuits, due to the limited recharge time, the minimum time interval between two flashes must not be less than 60ms, otherwise the energy will be insufficient.

[0041] In this invention, the first energy storage unit begins charging immediately after discharging at t=0, while the second energy storage unit discharges at t=T; subsequently, the first energy storage unit discharges again at t=2T. That is, each energy storage unit has a charging time of 2T between the end of its discharge and the start of the next discharge.

[0042] It is worth noting that since the two energy storage units share the same boost output terminal and are independently connected through isolation diodes, they charge in a partially overlapping manner in time (for example, in the interval from t=T to t=2T, while the first energy storage unit continues to charge, the second energy storage unit also begins to charge), and instantaneous energy support is provided by the high-voltage bus capacitor, i.e., the third capacitor C3.

[0043] To ensure that the energy storage voltage of the energy storage unit is not lower than the effective flash voltage before each discharge, it is only necessary to satisfy 2T≥60ms, i.e., T≥30ms. Therefore, this circuit can support a minimum flash interval of 30ms, which is twice as fast as the 60ms of the traditional single-capacitor solution.

[0044] In other words, by having two energy storage units work alternately, each energy storage unit obtains a charging window that is approximately twice the length of the flash interval, thereby breaking through the physical limitations of the single-capacitor architecture on the flash frequency without increasing the front-end charging power.

[0045] In addition, since the charging processes of the first energy storage unit and the second energy storage unit overlap in time, and both obtain charging current from the shared third capacitor C3, the boost unit does not need to provide the full charging current in a very short time.

[0046] Specifically, the third capacitor C3 acts as an energy buffer unit, absorbing the continuous power output of the boost unit and providing a large instantaneous current when the energy storage unit needs charging. This architecture allows the boost unit to be designed based on average power requirements without needing to be configured with peak power capabilities to handle large instantaneous currents, thus supporting high-frequency flash operation without increasing the power burden on the front end.

[0047] In other words, although the two energy storage units can be charged simultaneously, their instantaneous charging current is supplied by the third capacitor C3. The boost unit only needs to maintain the average energy balance of C3 and does not need to have high instantaneous power output capability.

[0048] 2. Application Scenario 2: Extreme continuous flash under dual-pulse burst triggering (breaking through the minimum flash interval limit) In another typical application, the external trigger signal is input in bursts in the form of paired double pulses, and the time interval between the two pulses is extremely short (much shorter than the full charging time of a single energy storage unit).

[0049] In this scenario, before receiving the dual-pulse external trigger signal, both the first and second energy storage units are charged and maintained at or above the effective flash voltage. When a pair of closely adjacent trigger pulses are received: The first pulse immediately turns on the first switching unit, causing the first energy storage unit to discharge to the lamp unit, producing the first flash; After a very short time interval Δt (e.g., 5ms, 10ms or less), the second pulse turns on the second switching unit, causing the second energy storage unit to discharge to the same lamp unit, producing a second flash.

[0050] Since the two discharges are completed by two independent energy storage units, each having reached its effective flash voltage, they are completely unaffected by the single capacitor's recharge time. The minimum interval Δt between the two flashes depends only on: (1) Arc extinction and dielectric recovery time of the lamp unit (usually in the range of microseconds to milliseconds); (2) The on / off response speed of the switching unit; (3) Signal processing and drive delay of the control circuit.

[0051] Therefore, in this mode, the present invention can achieve an ultra-short flash interval close to the physical limits of hardware, a function that traditional single energy storage unit solutions cannot achieve. This function is particularly suitable for professional applications requiring high-precision time resolution, dual-pulse energy output, or transient event capture. Additionally, it should be noted that after one dual-pulse flash, at least one full charging cycle is required for both energy storage units to reach an effective flash voltage to support the next dual-pulse trigger.

[0052] This invention enables the lamp control unit to respond to external trigger signals and alternately turn on the first and second switching units in a preset sequence, so that the first and second energy storage units take turns discharging to the same lamp unit. Only a single lamp unit is needed to support continuous high-frequency flashing, avoiding the need to add extra lamps to increase the flashing frequency, thereby saving hardware space and cost.

[0053] This invention also proposes a flash control method based on dual energy storage units, applied to the flash control circuit described above, including: Receive external trigger signals; In response to each received external trigger signal, perform the following operations: Send a control signal to the coil control unit to drive the trigger to generate a high voltage pulse, causing the gas inside the target lamp tube to break down and enter the conduction state; According to a preset sequence, a conduction signal is sent to the first or second switching unit, causing the corresponding energy storage unit to discharge through the target lamp tube that is already in the conduction state, so as to generate a flash.

[0054] This invention constructs a dual-energy storage architecture supporting dynamic charging scheduling by setting up a first charging branch consisting of a first isolation diode and a first energy storage unit, and a second charging branch consisting of a second isolation diode and a second energy storage unit, and connecting them in parallel to the output of the same boost unit. This is achieved without adding an independent charging circuit (i.e., without adding an additional boost unit). Since the two energy storage units are electrically connected to the boost output through isolation diodes, when one energy storage unit discharges through the lamp unit to generate flashes, the other energy storage unit maintains a charging path with the boost unit, thus allowing for immediate energy replenishment. During periods when neither energy storage unit is discharging, both are connected to the boost unit, enabling parallel charging. This mechanism effectively eliminates the bottleneck of waiting for a complete recharge cycle after discharge in single-capacitor schemes, significantly shortening the time interval between continuous flashes and improving the overall energy utilization efficiency of the system.

[0055] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0056] Furthermore, in this invention, descriptions involving terms such as "first," "second," and "a" are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0057] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0058] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

Claims

1. A flash control circuit based on dual energy storage units, characterized in that, include: The system comprises a boost unit, a first energy storage unit, a second energy storage unit, a first isolation diode, a second isolation diode, a first switching unit, a second switching unit, a lamp control unit, and a lamp unit, wherein: The boost unit is used to convert the input DC voltage into a high DC voltage; The first energy storage unit includes a first capacitor; The cathode of the first isolation diode is connected to the positive terminal of the first capacitor, and the anode is connected to the output terminal of the boost unit; The second energy storage unit includes a second capacitor; The cathode of the second isolation diode is connected to the positive terminal of the second capacitor, and the anode is connected to the output terminal of the boost unit; The first isolation diode and the first energy storage unit form a first charging branch, and the second isolation diode and the second energy storage unit form a second charging branch; the first charging branch and the second charging branch are connected in parallel to the output terminal of the boost unit to receive the DC high voltage; wherein, the conduction direction of each isolation diode is towards the corresponding energy storage unit; The first switching unit is connected in series between the first energy storage unit and the lamp unit to form a first discharge circuit; the second switching unit is connected in series between the second energy storage unit and the lamp unit to form a second discharge circuit. The first switching unit includes a first isolation driver and a first IGBT transistor; wherein: The collector of the first IGBT is connected to the positive terminal of the first capacitor, and the emitter is connected to the positive terminal of the lamp unit; The signal input terminal of the first isolation driver is connected to the lamp control unit, the signal output terminal is connected to the gate of the first IGBT, and the reference terminal of the first isolation driver is connected to the emitter of the first IGBT. The second switching unit includes a second isolation driver and a second IGBT transistor; wherein: The collector of the second IGBT is connected to the positive terminal of the second capacitor, and the emitter is connected to the positive terminal of the lamp unit; The signal input terminal of the second isolation driver is connected to the lamp control unit, the signal output terminal of the second isolation driver is connected to the gate of the second IGBT, and the reference terminal of the second isolation driver is connected to the emitter of the second IGBT. The lamp control unit is connected to the control terminals of the first switch unit and the second switch unit. It is used to respond to an external trigger signal and alternately turn on the first switch unit and the second switch unit in a preset order so that the first energy storage unit and the second energy storage unit alternately discharge through the lamp unit.

2. The flash control circuit based on a dual energy storage unit according to claim 1, characterized in that, The lamp control unit includes a counter configured to count external trigger signals; when the count value is odd, the first switching unit is turned on; when the count value is even, the second switching unit is turned on.

3. The flash control circuit based on a dual energy storage unit according to claim 1, characterized in that, The boost unit includes: a first inductor, a boost controller, a third switching transistor, a third isolation diode, and a third capacitor; wherein: The input terminal of the first inductor is used to connect to the input DC voltage; The drain of the third switching transistor is connected to the output terminal of the first inductor, and the source is connected to the ground terminal; The control terminal of the boost controller is connected to the gate of the third switch transistor and is used to output a pulse width modulation signal to control the on / off state of the third switch transistor. The anode of the third isolation diode is connected to the output terminal of the first inductor, and the cathode constitutes the output terminal of the boost unit; The third capacitor is connected between the output terminal of the boost unit and the ground terminal to store electrical energy and maintain the DC high voltage at the output terminal of the boost unit.

4. The flash control circuit based on a dual energy storage unit according to claim 1, characterized in that, The lamp unit includes a target lamp, a trigger, and a coil control unit; wherein: The target lamp has a positive terminal and a negative terminal. The positive terminal of the target lamp constitutes the positive terminal of the lamp unit and is simultaneously connected to the emitters of the first IGBT and the second IGBT. The negative terminal of the target lamp is grounded. The output of the trigger is connected to the trigger electrode of the target lamp tube; The coil control unit is connected to the trigger and is used to control the trigger to generate a high-voltage pulse to turn on the target lamp when it receives the control signal output by the lamp control unit.

5. A flash control circuit based on a dual energy storage unit according to claim 4, characterized in that, The target lamp is a xenon flash lamp, a krypton flash lamp, or a flash lamp containing a mixture of xenon and krypton.

6. A flash control method based on dual energy storage units, applied to the flash control circuit as described in any one of claims 1 to 5, characterized in that, include: Receive external trigger signals; In response to each received external trigger signal, perform the following operations: Send a control signal to the coil control unit to drive the trigger to generate a high voltage pulse, causing the gas inside the target lamp tube to break down and enter the conduction state; According to a preset sequence, a conduction signal is sent to the first or second switching unit, causing the corresponding energy storage unit to discharge through the target lamp tube that is already in the conduction state, so as to generate a flash.

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