Charging circuit

Abstract

The utility model relates to a charging circuit, which belongs to the technical field of high-voltage energy storage capacitor charging and comprises a slow start circuit, a rectification filter circuit, a high-frequency conversion unit, an LC (inductance-capacitance) linked resonance circuit, a high-frequency transformation rectification circuit and a high-voltage energy storage module. The high-frequency conversion unit is electrically connected with the LC-linked resonance circuit, the LC-linked resonance circuit is electrically connected with the high-frequency transformation and rectification circuit, and the high-frequency transformation and rectification circuit is electrically connected with the high-voltage energy storage module. According to the utility model, current flowing through the filter capacitor is limited in the starting process of the charging device mainly through the slow starting circuit, and the reliability of the charging circuit is improved through the redundancy design that the two LC resonance circuits are connected in parallel in the LC resonance circuit.

Description

TECHNICAL FIELD

[0001] The utility model relates to high pressure energy storage capacitor charging technical field especially relates to a charging circuit. BACKGROUND

[0002] The high pressure energy storage capacitor can provide pump energy for the pulse xenon lamp, in order to let high pressure energy storage capacitor in the stipulated time, voltage is promoted to the level of several tens of kilovolts, total energy is megajoule level, and the high -power charging device needs to have the characteristics such as high power, high reliability, high stability, strong self -fault strain capacity.

[0003] Since the energy storage capacitor cannot be in the high voltage state for a long time, otherwise there is the risk of internal breakdown. The required charging device must complete charging in a short time, and the power requirement of the charging device is high. It is difficult to overcome the large current peak value of the LC resonant circuit, and there is a possibility of charging failure, which leads to charging failure. After the charged energy is consumed by the energy dissipation resistor, it is charged again.

[0004] Since the pump energy of the pulse xenon lamp needs to be emitted by multiple paths at the same time, multiple high pressure energy storage capacitor charging devices are required to charge at the same time. When these high -power charging devices start at the same time, the impact on the local power grid is huge, which may cause voltage fluctuation of the power grid.

[0005] During the normal charging process of the energy storage capacitor, the high voltage to the ground after the voltage rises forms electromagnetic interference on the voltage sampling signal of the voltage divider, affecting the stability of the voltage detection, and reducing the reliability of the charging device. Therefore, the prior art has the technical problems of low reliability and poor stability of the charging device. INVENTION CONTENTS

[0006] Therefore, it is necessary to provide a charging circuit to solve the technical problems of low reliability and poor stability of the charging device in the prior art.

[0007] In order to achieve the above purpose, the utility model provides a charging circuit, which comprises:

[0008] The slow start circuit, the rectifier filter circuit, the high frequency conversion unit, the LC resonant circuit, the high frequency voltage conversion rectifier circuit and the high voltage energy storage module are connected in series.

[0009] The slow start circuit is electrically connected with the rectifier filter circuit.

[0010] The rectifier filter circuit is electrically connected with the high frequency conversion unit.

[0011] The high frequency conversion unit is electrically connected with the LC resonant circuit.

[0012] The LC resonant circuit is electrically connected with the high frequency voltage conversion rectifier circuit.

[0013] The high-frequency transformer rectifier circuit is electrically connected with the high-voltage energy storage module.

[0014] In a possible implementation, the slow start circuit comprises a main contactor and an auxiliary contactor.

[0015] The main contactor is electrically connected with the auxiliary contactor.

[0016] In a possible implementation, the rectifier filter circuit comprises a rectifier bridge, a smoothing reactor, a first resistor and a first capacitor.

[0017] The rectifier bridge is connected with the smoothing reactor.

[0018] The first resistor is electrically connected with the smoothing reactor.

[0019] The first capacitor is electrically connected in parallel with the first resistor.

[0020] The rectifier bridge is further electrically connected with the main contactor and the auxiliary contactor.

[0021] In a possible implementation, the high-frequency transformer unit comprises a first MOS tube, a second MOS tube, a third MOS tube, a fourth MOS tube, a fifth MOS tube, a sixth MOS tube, a seventh MOS tube and an eighth MOS tube.

[0022] The drain of the first MOS tube is electrically connected with the drain of the fourth MOS tube, the source of the second MOS tube, the source of the third MOS tube, the drain of the fifth MOS tube, the drain of the eighth MOS tube, the source of the sixth MOS tube and the source of the seventh MOS tube.

[0023] The source of the first MOS tube is electrically connected with the source of the fourth MOS tube, the drain of the second MOS tube and the drain of the third MOS tube.

[0024] The source of the fifth MOS tube is electrically connected with the source of the eighth MOS tube, the drain of the sixth MOS tube and the drain of the seventh MOS tube.

[0025] One end of the first capacitor is electrically connected with the drain of the first MOS tube and the drain of the fourth MOS tube.

[0026] The other end of the first capacitor is electrically connected with the source of the second MOS tube, the source of the third MOS tube, the drain of the fifth MOS tube, the drain of the eighth MOS tube, the source of the sixth MOS tube and the source of the seventh MOS tube.

[0027] In a possible implementation, the LC resonant circuit comprises a first resonant inductor, a second resonant inductor, a second capacitor and a third capacitor.

[0028] The first resonant inductor is electrically connected with the source of the first MOS tube and the drain of the second MOS tube.

[0029] The second capacitor is electrically connected with the source of the fourth MOS tube and the drain of the third MOS tube.

[0030] The second resonant inductor is electrically connected with the source of the fifth MOS tube and the drain of the sixth MOS tube.

[0031] The third capacitor is electrically connected with the source of the eighth MOS tube and the drain of the seventh MOS tube.

[0032] In a possible implementation, the high-frequency voltage transformation and rectification circuit comprises a first high-frequency transformer, a second high-frequency transformer, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a seventh diode and an eighth diode.

[0033] The first diode is electrically connected with the second diode, the third diode, the fourth diode, the fifth diode, the sixth diode, the seventh diode and the eighth diode.

[0034] The first end of the first high-frequency transformer is electrically connected with the first resonant inductor, the second end of the first high-frequency transformer is electrically connected with the second capacitor, the third end of the first high-frequency transformer is electrically connected with the second diode, and the fourth end of the first high-frequency transformer is electrically connected with the first diode.

[0035] The first end of the second high-frequency transformer is electrically connected with the second resonant inductor, the second end of the second high-frequency transformer is electrically connected with the third capacitor, the third end of the second high-frequency transformer is electrically connected with the sixth diode, and the fourth end of the second high-frequency transformer is electrically connected with the fifth diode.

[0036] In a possible implementation, the high-voltage energy storage module comprises a current sampling circuit and a T-type loop.

[0037] The current sampling circuit and the T-type loop are electrically connected.

[0038] The current sampling circuit is further electrically connected with the second diode, the third diode, the sixth diode and the seventh diode.

[0039] The T-type loop is further electrically connected with the first diode, the second diode, the third diode, the fourth diode, the fifth diode, the sixth diode, the seventh diode and the eighth diode.

[0040] In a possible implementation, the high-voltage energy storage module further comprises a ninth diode, a twelfth diode, a fourth capacitor, a fifth capacitor, a first voltage divider and a second voltage divider.

[0041] The fourth capacitor is connected in parallel with the first voltage divider;

[0042] The fifth capacitor is connected in parallel with the second voltage divider;

[0043] One end of the ninth diode is electrically connected with the fourth capacitor and the first voltage divider, and the other end of the ninth diode is electrically connected with the T-shaped circuit;

[0044] One end of the twelfth diode is electrically connected with the fifth capacitor and the second voltage divider, and the other end of the twelfth diode is electrically connected with the T-shaped circuit.

[0045] In a possible implementation manner, the T-shaped circuit comprises a second resistor, a third resistor and a fourth resistor;

[0046] The second resistor is electrically connected with the third resistor and the fourth resistor;

[0047] The third resistor is further electrically connected with the ninth diode;

[0048] The fourth resistor is further electrically connected with the twelfth diode.

[0049] In a possible implementation manner, the T-shaped circuit further comprises an eleventh diode, one end of the eleventh diode is electrically connected with the second resistor, the third resistor and the fourth resistor, and the other end of the eleventh diode is electrically connected with the fourth capacitor, the fifth capacitor, the first voltage divider and the second voltage divider.

[0050] The utility model provides a charging circuit, include: slow start circuit, rectification filter circuit, high frequency variable unit, LC series resonance circuit, high frequency variable pressure rectifier circuit and high pressure energy storage module, slow start circuit is electrically connected with rectification filter circuit, rectification filter circuit is electrically connected with high frequency variable unit, high frequency variable unit is electrically connected with LC series resonance circuit, LC series resonance circuit is electrically connected with high frequency variable pressure rectifier circuit, high frequency variable pressure rectifier circuit is electrically connected with high pressure energy storage module, the utility model mainly through slow start circuit, the current that flows through the filter capacitor is played the limiting effect in the starting process of charging device, reaches the purpose of slow power -on, guarantees the impact of multiple devices to power grid and starting to device when starting is lowest, and reaches the effect of derating design through the redundant design of parallel connection of two LC resonance circuits in LC series resonance circuit, namely, the current that single loop device bears in normal charging process is shared, the risk of damage of switching device, resonant device, line and coil winding caused by big current peak value is reduced, therefore, the reliability of charging device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0051] Figure 1 It is the structural diagram of the utility model charging circuit;

[0052] Figure 2The charging circuit diagram of the utility model. DETAILED DESCRIPTION

[0053] The preferred embodiments of the utility model will be described below in detail in conjunction with the drawings, wherein the drawings form a part of the present application, and are used together with the embodiments of the utility model to explain the principles of the utility model, and are not used to limit the scope of the utility model.

[0054] Figure 1 The structure diagram of the charging circuit of the utility model includes:

[0055] The slow start circuit 101, the rectifier filter circuit 102, the high frequency conversion unit 103, the LC series resonance circuit (the oscillation circuit of the frequency selection network composed of inductance and capacitance) 104, the high frequency transformer rectifier circuit 105 and the high voltage energy storage module 106;

[0056] The slow start circuit 101 is electrically connected with the rectifier filter circuit 102.

[0057] The rectifier filter circuit 102 is electrically connected with the high frequency conversion unit 103.

[0058] The high frequency conversion unit 103 is electrically connected with the LC series resonance circuit 104.

[0059] The LC series resonance circuit 104 is electrically connected with the high frequency transformer rectifier circuit 105.

[0060] The high frequency transformer rectifier circuit 105 is electrically connected with the high voltage energy storage module 106.

[0061] It can be understood that the utility model discloses a kind of charging devices of high voltage energy storage capacitor energy component, including slow start circuit 101 (i.e. main contactor and auxiliary contactor), rectifier filter circuit 102, high frequency conversion unit 103, LC series resonance circuit 104, high frequency transformer and its rectifier circuit, T type loop, high voltage energy storage capacitor C1 and C2, current sampling circuit, voltage divider;The slow start circuit includes main contactor, auxiliary contactor and current-limiting resistor and the rectifier circuit is connected;The rectifier filter circuit 102 connects high frequency conversion unit 103;The high frequency conversion unit 103 is connected with the LC resonance circuit;The LC series resonance circuit is connected with the high frequency transformer and its rectifier circuit;The T type loop is electrically connected with the energy storage capacitor C1 of high voltage energy storage capacitor energy component, C2;The voltage divider is connected with the high voltage energy storage capacitor C1, C2, and the current sampling circuit is connected in the low voltage side of high voltage charging loop in series.It is provided that the charging device has the advantages of high reliability in electrical performance, strong voltage sampling anti-electromagnetic interference and high voltage sampling stability.

[0062] It can be further understood that the current flowing through the filter capacitor is limited during the starting process of the charging device through the slow starting circuit 101 (i.e., the main contactor and the auxiliary contactor and the current limiting resistor), so as to achieve the purpose of slow power-on and ensure that the impact on the power grid and the device during starting is the lowest when multiple devices start simultaneously.

[0063] The charging is performed in a series resonance soft switching mode, the topology structure ensures that the charging current of the energy storage capacitor is constant, the inter-electrode voltage linearly rises, the stability of the charging device in the charging process is higher, the input power of the charging device linearly rises, and the impact on the power grid when multiple charging devices work is small.

[0064] The redundancy design of the two LC resonance loops in parallel is adopted. Firstly, through the redundancy design, the effect of derating design is achieved, i.e., the current borne by the single-loop device in the normal charging process is shared, the risk of damage of the switching device, the resonance device, the line and the coil winding caused by a large current peak value is reduced, and therefore the reliability of the charging device is improved. Secondly, through the redundancy design, the charging success rate is improved, i.e., when one loop of the charging device fails, the other loop works at full power to complete the charging of the high-voltage energy storage capacitor, and the charging success rate is improved. Thirdly, when multiple charging devices work simultaneously, the energy storage capacitor of all the charging devices does not need to dissipate energy through the energy dissipation resistor due to the failure of charging of one of the charging devices, energy is wasted, and the economy is improved as a whole.

[0065] The resonance inductance Lr in the LC series resonance circuit is replaced by the leakage inductance of the transformer, so as to save space and improve the economy.

[0066] The voltage divider of the utility model adopts differential sampling circuit, because high voltage to ground potential will produce interference in the charging process, in order to ensure the voltage accuracy of detection, the differential sampling voltage dividing circuit is used, the voltage collected and transmitted to the controller is the difference between the two ends of the resistor, the influence of sampling error is reduced, and the reliability of overall operation is improved.

[0067] Figure 2 The utility model discloses a charging circuit diagram, comprising:

[0068] The main contactor and the auxiliary contactor are electrically connected.

[0069] The main contactor is electrically connected with the auxiliary contactor.

[0070] In some embodiments of the utility model, the rectifier filter circuit 102 comprises a rectifier bridge, a smoothing reactor, a first resistor and a first capacitor.

[0071] The rectifier bridge is connected with the smoothing reactor.

[0072] The first resistor is electrically connected with the smoothing reactor.

[0073] The first capacitor is electrically connected in parallel with the first resistor.

[0074] The rectifier bridge is also electrically connected with the main contactor and the auxiliary contactor.

[0075] In some embodiments of the utility model, high frequency transform unit 103, include: first MOS (metal oxide semiconductor field effect transistor) tube, second MOS tube, third MOS tube, fourth MOS tube, fifth MOS tube, sixth MOS tube, seventh MOS tube and eighth MOS tube,

[0076] The drain of the first MOS tube is electrically connected with the drain of the fourth MOS tube, the source of the second MOS tube, the source of the third MOS tube, the drain of the fifth MOS tube, the drain of the eighth MOS tube, the source of the sixth MOS tube and the source of the seventh MOS tube.

[0077] The source of the first MOS tube is electrically connected with the source of the fourth MOS tube, the drain of the second MOS tube and the drain of the third MOS tube.

[0078] The source of the fifth MOS tube is electrically connected with the source of the eighth MOS tube, the drain of the sixth MOS tube and the drain of the seventh MOS tube.

[0079] One end of the first capacitor is electrically connected with the drain of the first MOS tube and the drain of the fourth MOS tube.

[0080] The other end of the first capacitor is electrically connected with the source of the second MOS tube, the source of the third MOS tube, the drain of the fifth MOS tube, the drain of the eighth MOS tube, the source of the sixth MOS tube and the source of the seventh MOS tube.

[0081] In some embodiments of the utility model, LC resonant circuit 104, include: first resonant inductor, second resonant inductor, second capacitor and third capacitor,

[0082] The first resonant inductor is electrically connected with the source of the first MOS tube and the drain of the second MOS tube.

[0083] The second capacitor is electrically connected with the source of the fourth MOS tube and the drain of the third MOS tube.

[0084] The second resonant inductor is electrically connected with the source of the fifth MOS tube and the drain of the sixth MOS tube.

[0085] The third capacitor is electrically connected with the source of the eighth MOS tube and the drain of the seventh MOS tube.

[0086] In some embodiments of the utility model, high frequency voltage transformation rectifier circuit 105, include: first high frequency transformer, second high frequency transformer, first diode, second diode, third diode, fourth diode, fifth diode, sixth diode, seventh diode and eighth diode,

[0087] First diode, with second diode, third diode, fourth diode, fifth diode, sixth diode, seventh diode and eighth diode electric connection;

[0088] The first end of the first high frequency transformer is electrically connected with the first resonant inductor, the second end of the first high frequency transformer is electrically connected with the second capacitor, the third end of the first high frequency transformer is electrically connected with the second diode, and the fourth end of the first high frequency transformer is electrically connected with the first diode;

[0089] The first end of the second high frequency transformer is electrically connected with the second resonant inductor, the second end of the second high frequency transformer is electrically connected with the third capacitor, the third end of the second high frequency transformer is electrically connected with the sixth diode, and the fourth end of the second high frequency transformer is electrically connected with the fifth diode.

[0090] In some embodiments of the utility model, high voltage energy storage module 106, include: current sampling circuit and T type loop;

[0091] Current sampling circuit and T type loop electric connection;

[0092] Current sampling circuit still with second diode, third diode, sixth diode and seventh diode electric connection;

[0093] T type loop still with first diode, second diode, third diode, fourth diode, fifth diode, sixth diode, seventh diode and eighth diode electric connection.

[0094] In some embodiments of the utility model, high voltage energy storage module 106 still include: ninth diode, twelfth diode, fourth capacitor, fifth capacitor, first voltage divider and second voltage divider;

[0095] Fourth capacitor and first voltage divider electric parallel;

[0096] Fifth capacitor and second voltage divider electric parallel;

[0097] One end of ninth diode is electrically connected with fourth capacitor and first voltage divider, and the other end of ninth diode is electrically connected with T type loop;

[0098] One end of the twelfth diode is electrically connected with the fifth capacitor and the second voltage divider, and the other end of the twelfth diode is electrically connected with the T-shaped circuit.

[0099] The second resistor is electrically connected with the third resistor and the fourth resistor;

[0100] The third resistor is also electrically connected with the ninth diode;

[0101] The fourth resistor is also electrically connected with the twelfth diode.

[0102] In some embodiments of the utility model, the T-shaped circuit further comprises an eleventh diode, one end of the eleventh diode is electrically connected with the second resistor, the third resistor and the fourth resistor, and the other end of the eleventh diode is electrically connected with the fourth capacitor, the fifth capacitor, the first voltage divider and the second voltage divider.

[0103] The above merely describes the preferred embodiments of the utility model, and the protection scope of the utility model is not limited to this, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A charging circuit, characterized by, include: Soft-start circuit, rectifier and filter circuit, high-frequency converter unit, LC resonant circuit, high-frequency transformer and rectifier circuit and high-voltage energy storage module; The soft-start circuit is electrically connected to the rectifier and filter circuit. The rectifier and filter circuit is electrically connected to the high-frequency converter unit; The high-frequency conversion unit is electrically connected to the LC resonant circuit. An LC resonant circuit is electrically connected to a high-frequency transformer-rectifier circuit. The high-frequency transformer rectifier circuit is electrically connected to the high-voltage energy storage module.

2. The charging circuit of claim 1, wherein, The soft-start circuit includes: a main contactor and an auxiliary contactor; The main contactor is electrically connected to the auxiliary contactor.

3. The charging circuit according to claim 1 or 2, characterized in that, The rectifier and filter circuit includes: a rectifier bridge, a smoothing reactor, a first resistor, and a first capacitor; The rectifier bridge is connected to the smoothing reactor battery; The first resistor is electrically connected to the smoothing reactor; The first capacitor is connected in parallel with the first resistor; The rectifier bridge is also electrically connected to the main contactor and the auxiliary contactor.

4. The charging circuit of claim 1, wherein, The high-frequency conversion unit includes: a first MOSFET, a second MOSFET, a third MOSFET, a fourth MOSFET, a fifth MOSFET, a sixth MOSFET, a seventh MOSFET, and an eighth MOSFET; The drain of the first MOSFET is electrically connected to the drain of the fourth MOSFET, the source of the second MOSFET, the source of the third MOSFET, the drain of the fifth MOSFET, the drain of the eighth MOSFET, the source of the sixth MOSFET, and the source of the seventh MOSFET. The source of the first MOSFET is electrically connected to the source of the fourth MOSFET, the drain of the second MOSFET, and the drain of the third MOSFET. The source of the fifth MOSFET is electrically connected to the source of the eighth MOSFET, the drain of the sixth MOSFET, and the drain of the seventh MOSFET. One end of the first capacitor is electrically connected to the drain of the first MOSFET and the drain of the fourth MOSFET. The other end of the first capacitor is electrically connected to the source of the second MOSFET, the source of the third MOSFET, the drain of the fifth MOSFET, the drain of the eighth MOSFET, the source of the sixth MOSFET, and the source of the seventh MOSFET.

5. The charging circuit according to claim 1 or 4, characterized in that, The LC resonant circuit includes: a first resonant inductor, a second resonant inductor, a second capacitor, and a third capacitor; The first resonant inductor is electrically connected to the source of the first MOSFET and the drain of the second MOSFET. The second capacitor is electrically connected to the source of the fourth MOSFET and the drain of the third MOSFET. The second resonant inductor is electrically connected to the source of the fifth MOSFET and the drain of the sixth MOSFET. The third capacitor is electrically connected to the source of the eighth MOSFET and the drain of the seventh MOSFET.

6. The charging circuit according to claim 1 or 5, characterized in that, The high-frequency transformer rectifier circuit includes: a first high-frequency transformer, a second high-frequency transformer, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a seventh diode, and an eighth diode; The first diode is electrically connected to the second, third, fourth, fifth, sixth, seventh, and eighth diodes. A first end of the first high-frequency transformer is electrically connected with the first resonant inductor, a second end of the first high-frequency transformer is electrically connected with the second capacitor, a third end of the first high-frequency transformer is electrically connected with the second diode, and a fourth end of the first high-frequency transformer is electrically connected with the first diode; A first end of the second high-frequency transformer is electrically connected with the second resonant inductor, a second end of the second high-frequency transformer is electrically connected with the third capacitor, a third end of the second high-frequency transformer is electrically connected with the sixth diode, and a fourth end of the second high-frequency transformer is electrically connected with the fifth diode.

7. The charging circuit according to claim 1 or 6, characterized in that, The high-voltage energy storage module comprises a current sampling circuit and a T-type loop. The current sampling circuit and the T-type loop are electrically connected. The current sampling circuit is further electrically connected with the second diode, the third diode, the sixth diode and the seventh diode. The T-type loop is further electrically connected with the first diode, the second diode, the third diode, the fourth diode, the fifth diode, the sixth diode, the seventh diode and the eighth diode.

8. The charging circuit of claim 7, wherein, The high-voltage energy storage module further comprises a ninth diode, a twelfth diode, a fourth capacitor, a fifth capacitor, a first voltage divider and a second voltage divider. The fourth capacitor is connected in parallel with the first voltage divider. The fifth capacitor is connected in parallel with the second voltage divider. One end of the ninth diode is electrically connected with the fourth capacitor and the first voltage divider, and the other end of the ninth diode is electrically connected with the T-type loop. One end of the twelfth diode is electrically connected with the fifth capacitor and the second voltage divider, and the other end of the twelfth diode is electrically connected with the T-type loop.

9. The charging circuit of claim 8, wherein, The T-type loop comprises a second resistor, a third resistor and a fourth resistor. The second resistor is electrically connected with the third resistor and the fourth resistor. The third resistor is further electrically connected with the ninth diode. The fourth resistor is further electrically connected with the twelfth diode.

10. The charging circuit of claim 9, wherein, The T-type loop further comprises an eleventh diode, one end of the eleventh diode is electrically connected with the second resistor, the third resistor and the fourth resistor, and the other end of the eleventh diode is electrically connected with the fourth capacitor, the fifth capacitor, the first voltage divider and the second voltage divider.

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