Reference current generating circuit and sorting band energy bank power supply

Abstract

The utility model provides a reference current generating circuit and a sorting band energy bank power supply, and the reference current generating circuit comprises a first input end which is used for receiving a light intensity reference signal; the second input end is used for receiving a light intensity feedback signal; the first input end and the second input end are connected with the negative input end of the operational amplifier, and the positive phase input end of the operational amplifier is connected with a grounding end; wherein the second input end is connected with the negative input end of the operational amplifier through a first divider resistor, a second divider resistor is connected between the negative input end of the operational amplifier and the output end, and when a light intensity feedback signal received by the second input end is zero, the second divider resistor is connected with the negative input end of the operational amplifier. And the voltage of a node between the first divider resistor and the second divider resistor is the voltage division value of the first divider resistor and the second divider resistor.

Description

Technical Field

[0001] The utility model relates to the technical field of power supplies, and particularly relates to a reference current generation circuit and a sorting belt energy storage power supply. Background Art

[0002] The reference current generation circuit of the sorting belt energy storage power supply receives a light intensity reference signal and a light intensity feedback signal, and generates a reference current signal according to the light intensity reference signal and the light intensity feedback signal. In a traditional reference current generation circuit, when both the light intensity reference signal and the light intensity feedback signal are 0, it is possible that the light intensity reference signal is slightly greater than the light intensity feedback signal, or it is possible that the light intensity feedback signal is slightly greater than the light intensity reference signal, resulting in an uncontrollable reference current signal finally generated. Summary of the Utility Model

[0003] In view of this, the problem to be solved by the utility model is to provide a reference current generation circuit and a sorting belt energy storage power supply.

[0004] A reference current generation circuit includes: a first input terminal for receiving a light intensity reference signal; a second input terminal for receiving a light intensity feedback signal; an operational amplifier, the first input terminal and the second input terminal are connected to the negative input terminal of the operational amplifier, and the positive input terminal of the operational amplifier is connected to the ground terminal; wherein, the second input terminal is connected to the negative input terminal of the operational amplifier via a first voltage-dividing resistor, and a second voltage-dividing resistor is connected between the negative input terminal and the output terminal of the operational amplifier. When the light intensity feedback signal received by the second input terminal is 0, the voltage at the node between the first voltage-dividing resistor and the second voltage-dividing resistor is the voltage division value of the first voltage-dividing resistor and the second voltage-dividing resistor.

[0005] Optionally, a clamping diode is connected between the negative input terminal and the output terminal of the operational amplifier. The positive electrode of the clamping diode is connected to the negative input terminal of the operational amplifier, and the negative electrode of the clamping diode is connected to the output terminal of the operational amplifier. When the output voltage of the operational amplifier is less than a predetermined voltage, the clamping diode pulls the negative input terminal of the operational amplifier below 0V, so that the output voltage of the operational amplifier rises to the predetermined voltage again.

[0006] Optionally, the resistance value of the first voltage-dividing resistor R42 is 100KΩ, and the resistance value of the second voltage-dividing resistor R52 is 20MΩ. When the light intensity feedback signal received by the second input terminal is 0, the voltage at the node between the first voltage-dividing resistor and the second voltage-dividing resistor is 0.075V, and the output voltage at the output terminal of the operational amplifier is fixed at -0.7V.

[0007] According to another aspect of the present invention, there is provided a sorting belt energy storage power supply, comprising: a control board; an AC / DC boost inverter module connected to the control board, and the control board provides a reference voltage to the AC / DC boost inverter module; an IGBT module connected to the control board and the AC / DC boost inverter module; an energy storage, the positive pole of the energy storage is connected between the positive-phase output terminal of the AC / DC boost inverter module and the emitter of the IGBT module, and the negative pole of the energy storage is connected between the negative-phase output terminal of the AC / DC boost inverter module and the gate of the IGBT module; a xenon lamp connected between the emitter and the gate of the IGBT module; and a trigger box connected to the control board and the xenon lamp, the control board is connected to the input terminal of the trigger box to provide a trigger signal to the trigger box, and the positive-phase output terminal and the negative-phase output terminal of the trigger box are respectively connected to the first end and the second end of the xenon lamp; wherein, the control board includes a single-chip microcomputer, the above-mentioned reference current generation circuit and a current comparator; the single-chip microcomputer is connected to the first input terminal of the reference current generation circuit to provide a light intensity reference signal to the first input terminal of the reference current generation circuit, and the output terminal of the reference current generation circuit is connected to the current comparator to provide a reference current signal to the current comparator.

[0008] Optionally, the current comparator receives the current reference signal output by the reference current generation circuit and the output current feedback signal of the IGBT module, and compares the two. When the reference current output by the reference current generation circuit is greater than the output current of the IGBT module, the current comparator provides a low level to the IGBT module, and the IGBT module stops discharging; when the reference current output by the reference current generation circuit is less than the output current of the IGBT module, the current comparator provides a high level to the IGBT module, and the IGBT module discharges.

[0009] Optionally, it further includes a diode, and the diode is connected between the positive-phase output terminal of the AC / DC boost inverter module and the positive pole of the energy storage.

[0010] Optionally, a filter module is further connected between the IGBT module 130 and the xenon lamp, and the filter module is an LC filter module composed of an inductor and a capacitor.

[0011] The advantages and positive effects of the present utility model are:

[0012] Compared with the traditional reference current generation circuit, in the reference current generation circuit of this embodiment, a second voltage dividing resistor R52 is added between the negative input terminal and the output terminal of the operational amplifier U3A. When the optical intensity feedback signal received by the second input terminal is 0, the voltage at node A between the first voltage dividing resistor R42 and the second voltage dividing resistor R52 is the voltage division value of the first voltage dividing resistor R42 and the second voltage dividing resistor R52, and the output voltage at the output terminal of the operational amplifier U3A is fixed at -0.7V. When working, the first input terminal receives the optical intensity reference signal, and the output voltage at the output terminal of the operational amplifier U3A increases from -0.7V, which will not cause overshoot of the output current and optical intensity.

[0013] Compared with the traditional reference current generation circuit, in the optical intensity of the reference current generation circuit of this embodiment, the reference signal changes from a positive voltage to a negative voltage and is input at the same terminal (such as the negative input terminal) of the operational amplifier U3A as the optical intensity feedback signal. Combined with the clamping diode D14, clamping can be conveniently achieved. Once the output voltage of the operational amplifier U3A is less than -0.7V, the clamping diode D14 will pull down the negative input terminal of the operational amplifier U3A below 0, so that the output voltage of the operational amplifier U3A will rise back to -0.7V. Description of the Drawings

[0014] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation to the present invention. In the drawings:

[0015] Figure 1 Shows the structural diagram of the sorting belt energy storage power supply according to the embodiment of the present application;

[0016] Figure 2 Shows the structural schematic diagram of the control board 110 according to the embodiment of the present application;

[0017] Figure 3 Shows the circuit schematic diagram of the reference current generation circuit according to the embodiment of the present application;

[0018] Figure 4 Shows the circuit schematic diagram of the traditional reference current generation circuit. Detailed Embodiments

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] It should be noted that when a component is referred to as "fixed to" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this utility model belongs. The terms used herein in the description of the present utility model are for the purpose of describing specific embodiments only and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0022] Figure 1 The structure diagram of the sorting belt energy storage power supply according to an embodiment of the present application is shown, as Figure 1 shown, the sorting belt energy storage power supply includes a control board 110, an AC / DC boost inverter module 120 connected to the control board 110, an IGBT module 130 connected to the control board 110, a trigger box 170 connected to the control board 110, and a xenon lamp 160 connected to the trigger box 170.

[0023] The control board 110 is connected to the reference voltage receiving terminal REF of the AC / DC boost inverter module 120 to provide a reference voltage to the AC / DC boost inverter module 120 through the reference voltage receiving terminal REF. The input end of the AC / DC boost inverter module 120 receives the mains (220V) voltage. The positive phase output terminal (OUT+) is connected to the emitter of the IGBT module 130, and the negative phase output terminal (OUT-) is connected to the gate of the IGBT module 130. The xenon lamp 160 is connected between the emitter and the gate of the IGBT module 130.

[0024] In this embodiment, a diode 150 and an energy storage 140 are also provided. In this embodiment, the energy storage 140 is, for example, an electrolytic capacitor. The positive electrode of the energy storage 140 is connected between the positive-phase output terminal (OUT+) of the AC / DC boost inverter module 120 and the emitter of the IGBT module 130, and the negative electrode of the energy storage 140 is connected between the negative-phase output terminal (OUT-) of the AC / DC boost inverter module 120 and the gate of the IGBT module 130. The diode 150 is connected between the positive-phase output terminal of the AC / DC boost inverter module 120 and the positive electrode of the energy storage. Specifically, the positive electrode of the diode 150 is connected to the positive-phase output terminal of the AC / DC boost inverter module 120, and the negative electrode of the diode 150 is connected to the positive electrode of the energy storage. In this embodiment, a diode 150 is added between the AC / DC boost inverter module 120 and the energy storage 140 to prevent the energy of the capacitor energy storage 140 from flowing back due to the damage of the AC / DC boost inverter module 120, increase the reliability of the power supply, and prevent the expansion of the fault.

[0025] In this embodiment, a filter module 180 is also connected between the IGBT module 130 and the xenon lamp 160. The filter module 180 is an LC filter module composed of an inductor and a capacitor. Specifically, the LC filter module 180 includes an inductor and a capacitor. The inductor is connected between the emitter of the IGBT module 130 and the first end of the xenon lamp 160, and the capacitor is connected between the first end and the second end of the xenon lamp 160.

[0026] Further, the control board 110 is connected to the emitter and the gate of the IGBT module 130. The control board 110 provides a discharge signal to the IGBT module 130 to drive the IGBT module 130 to discharge to the xenon lamp 160.

[0027] Further, the control board 110 is connected to the input terminal of the trigger box 170 to provide a trigger signal to the trigger box 170. The positive-phase output terminal and the negative-phase output terminal of the trigger box 170 are respectively connected to the first end and the second end of the xenon lamp 160.

[0028] During operation, the energy storage 140 is charged to 1100V via the AC / DC boost inverter module 120. The control board 110 provides a discharge signal to the IGBT module 130 to drive the IGBT module 130 to discharge to the xenon lamp 160, and the discharge current of the IGBT module 130 is provided to the xenon lamp 160 after being filtered by the LC filter module 180. The discharge signal provided by the control board 110 to the IGBT module 130 is a pulse waveform. At a predetermined time (for example, 500 us) before each pulse discharge, the control board 110 applies a voltage (for example, 20KV) to the trigger wire wound around the xenon lamp 160 through the trigger box 170 to form a pre-ionized plasma state in the xenon lamp 160 and wait for discharge.

[0029] Figure 2The structural schematic diagram of the control board 110 according to the embodiment of the present application is shown. As Figure 2 shown, the control board 110 includes a single-chip microcomputer 111, a reference current generation circuit 112 connected to the single-chip microcomputer 111, and a current comparator 113 connected to the reference current generation circuit 112. The single-chip microcomputer 111 is connected to the reference voltage receiving end REF of the AC / DC boost inverter module 120 to provide a reference voltage to the AC / DC boost inverter module 120. Moreover, the single-chip microcomputer 111 is connected to the trigger box 170 to provide a trigger signal to the trigger box 170.

[0030] The reference current generation circuit 112 receives the light intensity reference signal and the light intensity feedback signal, and provides a current reference signal to the current comparator 113. Figure 3 The circuit schematic diagram of the reference current generation circuit according to the embodiment of the present application is shown; as Figure 3 shown, the reference current generation circuit 112 includes a first input terminal, a second input terminal, and an operational amplifier U3A. The first input terminal of the reference current generation circuit 112 is connected to the single-chip microcomputer 111, and the single-chip microcomputer 111 provides the light intensity reference signal to the reference current generation circuit 112 via the first input terminal of the reference current generation circuit 112. The second input terminal receives the light intensity feedback signal. In one embodiment, the second input terminal is connected to the xenon lamp 160 via a light intensity sampling circuit, for example. The light intensity sampling circuit is used to sample the light intensity of the xenon lamp 160 and feed it back to the second terminal of the reference current generation circuit 112.

[0031] Further, in this embodiment, the first input terminal and the second input terminal of the reference current generation circuit 112 are connected to the negative-phase input terminal of the operational amplifier U3A, and the positive-phase input terminal of the operational amplifier U3A is connected to the ground terminal GND.

[0032] Further, in this embodiment, a first voltage-dividing resistor R42 is connected between the second input terminal and the negative-phase input terminal of the operational amplifier U3A, and a second voltage-dividing resistor R52 is connected between the negative-phase input terminal and the output terminal of the operational amplifier U3A. In this embodiment, by adding the second voltage-dividing resistor R52 between the negative-phase input terminal and the output terminal of the operational amplifier U3A, when the light intensity feedback signal received by the second input terminal is 0, the voltage at the node A between the first voltage-dividing resistor R42 and the second voltage-dividing resistor R52 is the voltage-dividing value of the first voltage-dividing resistor R42 and the second voltage-dividing resistor R52. In one embodiment, the resistance value of the first voltage-dividing resistor R42 is, for example, 100 KΩ, and the resistance value of the second voltage-dividing resistor R52 is, for example, 20 MΩ. When the light intensity feedback signal received by the second input terminal is 0, the voltage at the node A is about 0.075 V, and the output voltage at the output terminal of the operational amplifier U3A is fixed at -0.7 V. When working, the first input terminal receives the light intensity reference signal, and the output voltage at the output terminal of the operational amplifier U3A rises from -0.7 V, which will not cause overshoot of the output current and light intensity.

[0033] Further, in this embodiment, a clamping diode D14 is connected between the negative input terminal and the output terminal of the operational amplifier U3A. Specifically, the positive electrode of the clamping diode D14 is connected to the negative input terminal of the operational amplifier U3A, and the negative electrode of the clamping diode D14 is connected to the output terminal of the operational amplifier U3A. Wherein, when the output voltage of the operational amplifier U3A is less than -0.7V, the clamping diode D14 will pull down the negative input terminal of the operational amplifier U3A below 0V, causing the output voltage of the operational amplifier U3A to rise back to -0.7V.

[0034] The output terminal of the reference current generation circuit 112 is connected to the current comparator 113. The current comparator 113 receives the current reference signal output by the reference current generation circuit 112 and the output current feedback signal of the IGBT module 130, and compares the two. When the reference current output by the reference current generation circuit 112 is greater than the output current of the IGBT module 130, the current comparator 113 provides a high level to the IGBT module 130, and the IGBT module 130 discharges. When the reference current output by the reference current generation circuit 112 is less than the output current of the IGBT module 130, the current comparator 113 provides a low level to the IGBT module 130, and the IGBT module 130 stops discharging.

[0035] Figure 4 shows the circuit schematic diagram of a traditional reference current generation circuit, as Figure 4 shown, the traditional reference current generation circuit includes a first input terminal, a second input terminal, and an operational amplifier U3A. The first input terminal of the reference current generation circuit is connected to the single-chip microcomputer, and the single-chip microcomputer provides a light intensity reference signal to the reference current generation circuit via the first input terminal of the reference current generation circuit. The second input terminal receives the light intensity feedback signal. In one embodiment, the second input terminal is connected to the xenon lamp via a light intensity sampling circuit, for example. The light intensity sampling circuit is used to sample the light intensity of the xenon lamp and feedback it to the second terminal of the reference current generation circuit.

[0036] The first input terminal of the reference current generation circuit is connected to the positive input terminal of the operational amplifier U3, and the second input terminal is connected to the negative input terminal of the operational amplifier U3 via the resistor R4.

[0037] In the traditional reference current generation circuit, when both the light intensity reference signal and the light intensity feedback signal are 0, it is possible that the light intensity reference signal is slightly greater than the light intensity feedback signal, or it is also possible that the light intensity feedback signal is slightly greater than the light intensity reference signal, resulting in an uncontrollable output level of the operational amplifier U3. In addition, the positive phase of the operational amplifier U3 inputs the light intensity reference signal, and the negative phase inputs the light intensity feedback signal. When the traditional reference current stops working, the output of the operational amplifier U3A is in the negative saturation state (-15V). When the normal output occurs, the output of the operational amplifier U3 will rise from -15V to the normal error voltage output, and the current output will only occur when the error voltage is above 0V.

[0038] Compared with the traditional reference current generation circuit, in the reference current generation circuit of this embodiment, a second voltage dividing resistor R52 is added between the negative phase input terminal and the output terminal of the operational amplifier U3A. When the light intensity feedback signal received by the second input terminal is 0, the voltage at the node A between the first voltage dividing resistor R42 and the second voltage dividing resistor R52 is the voltage division value of the first voltage dividing resistor R42 and the second voltage dividing resistor R52, and the output voltage at the output terminal of the operational amplifier U3A is fixed at -0.7V. When working, the first input terminal receives the light intensity reference signal, and the output voltage at the output terminal of the operational amplifier U3A rises from -0.7V, which will not cause overshoot of the output current and light intensity.

[0039] Compared with the traditional reference current generation circuit, in the light intensity of the reference current generation circuit of this embodiment, the reference signal changes from positive voltage to negative voltage and is input at the same end (such as the negative phase input terminal) of the operational amplifier U3A as the light intensity feedback signal. Combined with the clamping diode D14, clamping can be conveniently achieved. Once the output voltage of the operational amplifier U3A is less than -0.7V, the clamping diode D14 will pull down the negative phase input terminal of the operational amplifier U3A below 0, so that the output voltage of the operational amplifier U3A will rise back to -0.7V.

[0040] The above has described the embodiments of the present invention in detail, but the content described is only the preferred embodiments of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the present invention should still fall within the scope covered by this patent.

Claims

1. A reference current generating circuit, characterized in that Comprising: A first input terminal for receiving a light intensity reference signal; A second input terminal for receiving a light intensity feedback signal; An operational amplifier, wherein the first input terminal and the second input terminal are connected to the negative input terminal of the operational amplifier, and the positive input terminal of the operational amplifier is connected to the ground terminal; Wherein, the second input terminal is connected to the negative input terminal of the operational amplifier via a first voltage dividing resistor, and a second voltage dividing resistor is connected between the negative input terminal and the output terminal of the operational amplifier. When the light intensity feedback signal received by the second input terminal is 0, the voltage at the node between the first voltage dividing resistor and the second voltage dividing resistor is the voltage division value of the first voltage dividing resistor and the second voltage dividing resistor.

2. The reference current generating circuit according to claim 1, characterized in that A clamping diode is connected between the negative input terminal and the output terminal of the operational amplifier. The positive electrode of the clamping diode is connected to the negative input terminal of the operational amplifier, and the negative electrode of the clamping diode is connected to the output terminal of the operational amplifier. When the output voltage of the operational amplifier is less than a predetermined voltage, the clamping diode pulls the negative input terminal of the operational amplifier below 0V, causing the output voltage of the operational amplifier to rise back to the predetermined voltage.

3. The reference current generating circuit according to claim 2, wherein The resistance value of the first voltage dividing resistor R42 is 100KΩ, and the resistance value of the second voltage dividing resistor R52 is 20MΩ. When the light intensity feedback signal received by the second input terminal is 0, the voltage at the node between the first voltage dividing resistor and the second voltage dividing resistor is 0.075V, and the output voltage at the output terminal of the operational amplifier is fixed at -0.7V.

4. A sorting belt energy storage power supply, characterized in that Comprising: A control board; An AC / DC boost inverter module connected to the control board, and the control board provides a reference voltage to the AC / DC boost inverter module; An IGBT module connected to the control board and the AC / DC boost inverter module; An energy storage bank, the positive electrode of the energy storage bank is connected between the positive output terminal of the AC / DC boost inverter module and the emitter of the IGBT module, and the negative electrode of the energy storage bank is connected between the negative output terminal of the AC / DC boost inverter module and the gate of the IGBT module; A xenon lamp connected between the emitter and the gate of the IGBT module; and A trigger box connected to the control board and the xenon lamp. The control board is connected to the input terminal of the trigger box to provide a trigger signal to the trigger box. The positive output terminal and the negative output terminal of the trigger box are respectively connected to the first end and the second end of the xenon lamp; Wherein, the control board includes a single-chip microcomputer, the reference current generation circuit according to any one of claims 1 to 3, and a current comparator; the single-chip microcomputer is connected to the first input terminal of the reference current generation circuit to provide a light intensity reference signal to the first input terminal of the reference current generation circuit, and the output terminal of the reference current generation circuit is connected to the current comparator to provide a reference current signal to the current comparator.

5. The sorting belt energy storage power supply according to claim 4, wherein The current comparator receives the current reference signal output by the reference current generation circuit and the output current feedback signal of the IGBT module, and compares the two. When the reference current output by the reference current generation circuit is greater than the output current of the IGBT module, the current comparator provides a low level to the IGBT module, and the IGBT module stops discharging; when the reference current output by the reference current generation circuit is less than the output current of the IGBT module, the current comparator provides a high level to the IGBT module, and the IGBT module discharges.

6. The sorting belt energy storage power supply according to claim 4, characterized in that, It further includes a diode, which is connected between the positive-phase output terminal of the AC / DC boost inverter module and the positive pole of the energy storage bank.

7. The sorting belt energy storage power supply according to claim 4, characterized in that, A filter module is also connected between the IGBT module 130 and the xenon lamp, and the filter module is an LC filter module composed of an inductor and a capacitor.

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