Charging circuit and pulse xenon lamp charging device

Abstract

The utility model provides a charging circuit and a pulse xenon lamp charging device. The charging circuit comprises an inversion module, a resonance module and an energy storage module. The first end of the resonance module is connected with the inversion module, and the second end of the resonance module is connected with the first end of the energy storage module; the second end of the energy storage module is connected with an external load; the energy storage module comprises a transformer; a primary winding of the transformer is connected in series with the resonance module; a primary winding of the transformer, the inversion module and the resonance module form an inversion loop; the inversion module is used for enabling an inversion loop to output constant current by adjusting the inversion frequency of the inversion module; and the energy storage module is used for charging an external load based on the constant current. In the mode, the primary winding of the transformer, the inversion module and the resonance module form the inversion loop, and the inversion loop outputs the constant current, so that the working efficiency of the charging circuit is improved, and the size of the charging circuit is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of pulse xenon lamps, in particular to a charging circuit and a pulse xenon lamp charging device. Background Art

[0002] A pulse xenon lamp is a xenon lamp that uses stored electrical energy or chemical energy to produce a high-intensity flash in a very short time. The load of the charging circuit of an existing pulse xenon lamp is an energy storage capacitor, and the charging circuit charges the pulse xenon lamp through the energy storage capacitor. During the charging process of the energy storage capacitor, the inverter frequency of the charging circuit connected to the energy storage capacitor is constant, and the current of the charging circuit changes from large to small, resulting in a large reactive current in the charging circuit, which reduces the working efficiency of the charging circuit. At the same time, due to the large reactive current in the charging circuit, the charging circuit requires a large volume for heat dissipation, which makes the volume of the charging circuit larger. Utility Model Content

[0003] In view of this, an object of the present invention is to provide a charging circuit and a pulse xenon lamp charging device, so as to improve the working efficiency of the charging circuit and further reduce the volume of the charging circuit.

[0004] In the first aspect, an embodiment of the utility model provides a charging circuit, including: an inverter module, a resonance module and an energy storage module; the first end of the resonance module is connected to the inverter module, and the second end of the resonance module is connected to the first end of the energy storage module; the second end of the energy storage module is connected to an external load; the energy storage module includes a transformer; the primary winding of the transformer is connected in series with the resonance module; the primary winding of the transformer, the inverter module and the resonance module constitute an inverter circuit; the inverter module is used to make the inverter circuit output a constant current by adjusting its own inverter frequency; the energy storage module is used to charge the external load based on the constant current.

[0005] Furthermore, the energy storage module also includes a rectifier unit and an energy storage capacitor; the secondary winding of the transformer is connected in parallel with the rectifier unit; the rectifier unit is connected in parallel with the energy storage capacitor; and the energy storage capacitor is connected to an external load.

[0006] Furthermore, the resonance module includes a resonance inductor and a resonance capacitor connected in series; the second end of the resonance capacitor is connected to the first end of the primary winding of the transformer.

[0007] Furthermore, the inverter module includes an inverter and a sampling unit; the first end of the inverter is connected to the first end of the resonant inductor; the second end of the inverter is connected to the first end of the sampling unit; the second end of the sampling unit is connected to the second end of the primary winding of the transformer.

[0008] Furthermore, the inverter includes an inverter bridge, a controller and a driver; the driver is connected to the inverter bridge and the driver respectively; and the controller is connected to the sampling unit.

[0009] Furthermore, the charging circuit also includes a power module; the power module is connected to the inverter module; and the power module includes a filter capacitor.

[0010] Furthermore, the power module also includes a rectifier.

[0011] In the second aspect, an embodiment of the utility model provides a pulse xenon lamp charging device, comprising: a pre-ignition circuit, a discharge circuit and a pulse xenon lamp connected in sequence; also comprising a charging circuit of any of the above items; the first end of the charging circuit is connected to the first end of the pre-ignition circuit; the second end of the pulse xenon lamp is connected to the second end of the charging circuit.

[0012] Furthermore, the charging circuit includes an energy storage capacitor; the pre-ignition circuit is a current limiting inductor; and the first end of the current limiting inductor is connected to the first end of the energy storage capacitor.

[0013] Furthermore, the discharge circuit includes a thyristor and a high-voltage isolating switch connected in sequence; the first end of the thyristor is connected to the second end of the current-limiting inductor; the second end of the high-voltage isolating switch is connected to the first end of the pulse xenon lamp; and the second end of the pulse xenon lamp is connected to the second end of the energy storage capacitor.

[0014] The embodiment of the utility model provides a charging circuit and a pulse xenon lamp charging device, including: an inverter module, a resonance module and an energy storage module; the first end of the resonance module is connected to the inverter module, and the second end of the resonance module is connected to the first end of the energy storage module; the second end of the energy storage module is connected to an external load; the energy storage module includes a transformer; the primary winding of the transformer is connected in series with the resonance module; the primary winding of the transformer, the inverter module and the resonance module constitute an inverter circuit; the inverter module is used to adjust its own inverter frequency so that the inverter circuit outputs a constant current; the energy storage module is used to charge the external load based on the constant current. In this method, the primary winding of the transformer, the inverter module and the resonance module constitute an inverter circuit, so that the inverter circuit outputs a constant current, thereby improving the working efficiency of the charging circuit and reducing the volume of the charging circuit.

[0015] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by practicing the utility model. The purpose and other advantages of the utility model are realized and obtained by the structures specifically pointed out in the description, claims and drawings.

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A module diagram of a charging circuit provided in Embodiment 1 of the present utility model;

[0019] Figure 2 A circuit diagram of a charging circuit provided in Embodiment 1 of the present utility model;

[0020] Figure 3 A schematic diagram of an inverter provided in Embodiment 1 of the present utility model;

[0021] Figure 4 This is a schematic diagram of an equivalent circuit of an inverter circuit provided in Embodiment 1 of the present utility model;

[0022] Figure 5 Another charging circuit module diagram provided for the second embodiment of the utility model;

[0023] Figure 6 A schematic diagram of a pulse xenon lamp charging device provided in the second embodiment of the present utility model;

[0024] Figure 7 This is a circuit diagram of a pulse xenon lamp charging device provided in Example 2 of the utility model.

[0025] Icon: 1-inverter module; 2-resonance module; 3-energy storage module; 4-power module; 5-pre-ignition circuit; 6-discharge circuit; 7-pulse xenon lamp; 8-charging circuit; M1-first inverter bridge; M2-second inverter bridge; M3-third inverter bridge; M4-fourth inverter bridge; L1-resonant inductor; C1-resonant capacitor; T1-transformer; DB1-first rectifier; DB2-second rectifier; C2-energy storage capacitor; CT1-current transformer; E1-filter capacitor; L2-current limiting inductor; S1-high voltage isolating switch; SCR-thyristor. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] To facilitate understanding of this embodiment, the embodiment of the utility model is described in detail below.

[0028] Embodiment 1:

[0029] Figure 1 This is a module diagram of a charging circuit provided in Embodiment 1 of the present utility model.

[0030] Figure 2 This is a circuit diagram of a charging circuit provided in Embodiment 1 of the present utility model.

[0031] Reference Figure 1 The charging circuit includes: an inverter module 1, a resonance module 2 and an energy storage module 3; the first end of the resonance module 2 is connected to the inverter module 1, and the second end of the resonance module 2 is connected to the first end of the energy storage module 3; the second end of the energy storage module 3 is connected to an external load; the energy storage module 3 includes a transformer T1; the primary winding of the transformer T1 is connected in series with the resonance module 2; the primary winding of the transformer T1, the inverter module 1 and the resonance module 2 constitute an inverter circuit.

[0032] The inverter module 1 is used to adjust its own inverter frequency so that the inverter circuit outputs a constant current.

[0033] The energy storage module 3 is used to charge the external load based on a constant current.

[0034] Here, the external load may be a pulsed xenon lamp.

[0035] The constant current output by the inverter circuit is the current passing through the resonance module 2. The inverter module 1 ensures that the current passing through the resonance module 2 is constant by adjusting its own inverter frequency, so that the inverter circuit outputs a constant current.

[0036] In one embodiment, referring to Figure 2 The resonance module 2 includes a resonance inductor L1 and a resonance capacitor C1 connected in series; the second end of the resonance capacitor C1 is connected to the first end of the primary winding of the transformer T1.

[0037] Here, the resonant inductor L1 and the resonant capacitor C1 have the greatest blocking effect on the resonant frequency, preventing the resonant signal from flowing out, but other signals can pass through.

[0038] In one embodiment, referring to Figure 5 The charging circuit also includes a power module 4; the power module 4 is connected to the inverter module 1; Figure 2 The power module 4 includes a filter capacitor E1. The power module 4 also includes a first rectifier DB1.

[0039] Here, the first rectifier DB1 is used to connect to the mains to convert the alternating current into direct current. The filter capacitor E1 is used to filter the converted direct current.

[0040] In one embodiment, referring to Figure 2 The inverter module 1 includes an inverter and a sampling unit; the first end of the inverter is connected to the first end of the resonant inductor L1; the second end of the inverter is connected to the first end of the sampling unit; the second end of the sampling unit is connected to the second end of the primary winding of the transformer T1.

[0041] Reference Figure 3 The inverter includes an inverter bridge, a controller and a driver; the driver is connected to the inverter bridge and the driver respectively; and the controller is connected to the sampling unit.

[0042] Here, the inverter is used to convert the direct current sent by the power module 4 into alternating current.

[0043] The inverter includes a first inverter bridge M1, a second inverter bridge M2, a third inverter bridge M3 and a fourth inverter bridge M4. The first end of the first inverter bridge M1 and the first end of the second inverter bridge M2 are respectively connected to the first end of the power module 4, and the second end of the third inverter bridge M3 and the second end of the fourth inverter bridge M4 are respectively connected to the second end of the power module 4. The first inverter bridge M1 and the third inverter bridge M3 intersect at a first point, and the second inverter bridge M2 and the fourth inverter bridge M4 intersect at a second point.

[0044] The resonant inductor L1 is connected to a first point of the inverter, and the sampling unit is connected to a second point of the inverter.

[0045] The controller may be a PWM control chip.

[0046] The sampling unit is used to collect the real-time current of the resonance module 2 and may be a current transformer CT1.

[0047] The energy storage module 3 further includes a rectifier unit and an energy storage capacitor C2; the secondary winding of the transformer T1 is connected in parallel with the rectifier unit; the rectifier unit is connected in parallel with the energy storage capacitor C2; and the energy storage capacitor C2 is connected to an external load.

[0048] Here, the voltage U2 at the primary winding of the transformer T1, the voltage U3 at the secondary winding of the transformer T1, and the voltage U3 of the energy storage capacitor C2 are proportional to each other.

[0049] The transformer T1 converts the received voltage into a voltage suitable for the energy storage capacitor C2 through a preset proportional relationship between the primary winding and the secondary winding.

[0050] The rectifying unit may be a second rectifier DB2, which is used to rectify the alternating current output by the secondary winding of the transformer T1 into direct current, so as to charge the energy storage capacitor C2.

[0051] Specifically, the inverter circuit is composed of an inverter, a resonant inductor L1, a resonant capacitor C1, a primary winding of a transformer T1 and a sampling unit.

[0052] Reference Figure 4 In the equivalent circuit of the inverter circuit, when the oscillation frequency fs of the inverter circuit is less than the resonant frequency f0 of the resonant inductor L1 and the resonant capacitor C1, the inverter circuit works in an inductive state, and the equivalent impedance value of the resonant inductor L1 and the resonant capacitor C1 is shown in formula (1):

[0053]

[0054] Where, Z is the equivalent impedance value of the resonant inductor L1 and the resonant capacitor C1, XL is the inductive reactance, L is the inductance value of the resonant inductor L1, XC is the capacitive reactance, C is the capacitance value of the resonant capacitor C1, and f s It is the oscillation frequency of the actual operation of the inverter circuit.

[0055] The loop current of the inverter circuit is expressed by the following formula (2):

[0056]

[0057] Among them, i is the loop current, U0 is the equivalent voltage of the energy storage capacitor C2, and U1 is the inverter voltage.

[0058] U0 increases with the increase of the voltage U3 of the energy storage capacitor C2 in the energy storage unit, which is equivalent to a decrease in the voltage across the equivalent impedance value Z. To maintain the loop current i unchanged, the equivalent impedance value Z must be reduced in the same proportion. Reduce the oscillation frequency f s , the equivalent impedance value Z can be reduced to maintain the loop current i unchanged.

[0059] Specifically, in the inverter, the PWM control chip obtains the real-time current collected by the current transformer CT1 passing through the resonance module 2. When the real-time current reaches a preset constant current value, the PWM control chip adjusts the oscillation frequency through the driver to make the current constant.

[0060] The embodiment of the utility model provides a charging circuit, including: an inverter module, a resonance module and an energy storage module; the first end of the resonance module is connected to the inverter module, and the second end of the resonance module is connected to the first end of the energy storage module; the second end of the energy storage module is connected to an external load; the energy storage module includes a transformer; the primary winding of the transformer is connected in series with the resonance module; the primary winding of the transformer, the inverter module and the resonance module constitute an inverter circuit; the inverter module is used to adjust its own inverter frequency so that the inverter circuit outputs a constant current; the energy storage module is used to charge the external load based on the constant current. In this method, the primary winding of the transformer, the inverter module and the resonance module constitute an inverter circuit, so that the inverter circuit outputs a constant current, thereby improving the working efficiency of the charging circuit and reducing the volume of the charging circuit.

[0061] Embodiment 2:

[0062] Figure 6 This is a schematic diagram of a pulse xenon lamp charging device provided in Example 2 of the present utility model.

[0063] Figure 7 This is a circuit diagram of a pulse xenon lamp charging device provided in Example 2 of the utility model.

[0064] Reference Figure 6 and Figure 7 , a pulse xenon lamp charging device, comprising: a pre-ignition circuit 5, a discharge circuit 6 and a pulse xenon lamp 7 connected in sequence; also comprising a charging circuit 8 of any of the above items; the first end of the charging circuit 8 is connected to the first end of the pre-ignition circuit 5; the second end of the pulse xenon lamp 7 is connected to the second end of the charging circuit 8.

[0065] In one embodiment, the charging circuit 8 includes an energy storage capacitor C2; the pre-ignition circuit 5 is a current limiting inductor L2; and a first end of the current limiting inductor L2 is connected to a first end of the energy storage capacitor C2.

[0066] In one embodiment, the discharge circuit 6 includes a thyristor SCR and a high-voltage isolating switch S1 connected in sequence; the first end of the thyristor SCR is connected to the second end of the current-limiting inductor L2; the second end of the high-voltage isolating switch S1 is connected to the first end of the pulse xenon lamp 7; the second end of the pulse xenon lamp 7 is connected to the second end of the energy storage capacitor C2.

[0067] Here, the second end of the thyristor SCR is connected to the first end of the high-voltage isolating switch S1, the thyristor SCR is connected to the energy storage capacitor C2 through the current limiting inductor L2, and the thyristor SCR is disconnected from the pulse xenon lamp 7 and the pre-ignition circuit 5 through the high-voltage isolating switch S1. Under normal circumstances, the pulse xenon lamp 7 is in a high impedance state, and its equivalent impedance value is infinite, and the energy storage capacitor C2 under normal application conditions cannot discharge it.

[0068] The pre-ignition circuit 5 outputs a high voltage pulse (ie, pre-ignition high voltage) sufficient to break down the positive and negative electrodes of the pulse xenon lamp 7 .

[0069] When the pulse xenon lamp 7 is broken down, the pre-ignition circuit 5 provides a constant pre-ignition current to maintain the pulse xenon lamp 7 in a relatively stable arc discharge state. The arc current at this time is the pre-ignition current; the state at this time is a pre-ignition success state.

[0070] The pulse xenon lamp 7 in the pre-ignition success state is in a low impedance state (for example, when the pre-ignition current is 200 mA, the lamp voltage is between 60V and 200V).

[0071] The pre-ignition success signal closes the high-voltage isolating switch S1. At this time, the thyristor SCR receives the discharge trigger pulse, and the energy storage capacitor C2 can discharge the pulse xenon lamp 7.

[0072] An embodiment of the utility model provides a pulse xenon lamp charging device, in which the primary winding of the transformer, the inverter module and the resonance module are formed into an inverter circuit, and the inverter circuit outputs a constant current, thereby improving the working efficiency of the charging circuit and reducing the size of the charging circuit.

[0073] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0074] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0075] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the utility model can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the utility model. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0076] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0077] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the utility model, which are used to illustrate the technical solution of the utility model, rather than to limit it. The protection scope of the utility model is not limited thereto. Although the utility model is described in detail with reference to the above-mentioned embodiments, ordinary technicians in this field should understand that any technician familiar with the technical field can still modify the technical solution recorded in the above-mentioned embodiments within the technical scope disclosed by the utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the utility model, and should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A charging circuit, characterized in that: include: An inverter module, a resonance module and an energy storage module; the first end of the resonance module is connected to the inverter module, the second end of the resonance module is connected to the first end of the energy storage module; the second end of the energy storage module is connected to an external load; the energy storage module includes a transformer; the primary winding of the transformer is connected in series with the resonance module; the primary winding of the transformer, the inverter module and the resonance module constitute an inverter circuit; The inverter module is used to make the inverter circuit output a constant current by adjusting its own inverter frequency; The energy storage module is used to charge the external load based on the constant current.

2. The charging circuit according to claim 1, characterized in that: The energy storage module also includes a rectifier unit and an energy storage capacitor; the secondary winding of the transformer is connected in parallel with the rectifier unit; the rectifier unit is connected in parallel with the energy storage capacitor; and the energy storage capacitor is connected to the external load.

3. The charging circuit according to claim 2, characterized in that: The resonance module includes a resonance inductor and a resonance capacitor connected in series; the second end of the resonance capacitor is connected to the first end of the primary winding of the transformer.

4. The charging circuit according to claim 3, characterized in that: The inverter module includes an inverter and a sampling unit; the first end of the inverter is connected to the first end of the resonant inductor; the second end of the inverter is connected to the first end of the sampling unit; the second end of the sampling unit is connected to the second end of the primary winding of the transformer.

5. The charging circuit according to claim 4, characterized in that: The inverter includes an inverter bridge, a controller and a driver; the driver is connected to the inverter bridge and the driver respectively; and the controller is connected to the sampling unit.

6. The charging circuit according to claim 1, characterized in that: The charging circuit also includes a power module; the power module is connected to the inverter module; the power module includes a filter capacitor.

7. The charging circuit according to claim 6, characterized in that: The power module also includes a rectifier.

8. A pulse xenon lamp charging device, characterized in that: include: A pre-ignition circuit, a discharge circuit and a pulse xenon lamp connected in sequence; and also comprising a charging circuit as claimed in any one of claims 1 to 7; The first end of the charging circuit is connected to the first end of the pre-ignition circuit; the second end of the pulse xenon lamp is connected to the second end of the charging circuit.

9. The pulse xenon lamp charging device according to claim 8, characterized in that: The charging circuit includes an energy storage capacitor; the pre-ignition circuit is a current limiting inductor; the first end of the current limiting inductor is connected to the first end of the energy storage capacitor.

10. The pulse xenon lamp charging device according to claim 9, characterized in that: The discharge circuit includes a thyristor and a high-voltage isolating switch connected in sequence; the first end of the thyristor is connected to the second end of the current-limiting inductor; the second end of the high-voltage isolating switch is connected to the first end of the pulse xenon lamp; the second end of the pulse xenon lamp is connected to the second end of the energy storage capacitor.

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