Current comparison circuit and sorting band energy bank power supply
By introducing resistors and anti-shandling diodes or capacitors into the current comparator, the problems of instability and static error in the current comparison circuit are solved, and more stable current comparison and error reduction are achieved, improving the reliability of the circuit.
Patent Information
- Application Number
- CN202422409433.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-09-30
AI Technical Summary
There are problems of instability in comparison points and solid-state electrostatic errors in traditional current comparison circuits.
By connecting the resistor and the anti-shandling diode between the normal phase input and output of the current comparator, or replaced with a capacitor, a difference-free system is formed to improve the stability of the comparison point and a voltage divider is formed through the current comparator output high to reduce static errors.
It improves the stability of the circuit comparison point, reduces solid-state electrostatic error, and enhances the reliability of the current comparison circuit.
Smart Images
Figure CN223167062U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power supplies, and particularly relates to a current comparison circuit and a sorting belt energy storage power supply. Background Art
[0002] The current comparison circuit of the sorting belt energy storage power supply receives a current reference signal and a current feedback signal, and generates a pulse discharge signal according to the current reference signal and the current feedback signal. In the traditional current comparison circuit, there are problems of unstable comparison points and static electricity errors of the solid state. Summary of the Utility Model
[0003] In view of this, the problem to be solved by the utility model is to provide a current comparison circuit and a sorting belt energy storage power supply.
[0004] A current comparison circuit includes: a reference current input terminal for receiving a reference current signal; a feedback current input terminal for receiving a feedback current signal; a current comparator, the reference current input terminal is connected to the positive input terminal of the current comparator via a first resistor, and the feedback current input terminal is connected to the negative input terminal of the current comparator via a second resistor; wherein, a third resistor and an antiparallel diode are connected between the positive input terminal and the output terminal of the current comparator, the third resistor is connected between the positive input terminal of the current comparator and the anode of the antiparallel diode, and the cathode of the antiparallel diode is connected to the output terminal of the current comparator.
[0005] Optionally, when the reference current at the reference current input terminal is greater than the feedback current at the feedback current input terminal, the current comparator outputs a high level, and when the reference current at the reference current input terminal is less than the feedback current at the feedback current input terminal, the current comparator outputs a low level.
[0006] Optionally, when the reference current at the reference current input terminal is greater than the feedback current at the feedback current input terminal, the current comparator outputs a high level, and a comparison point between the first resistor and the third resistor forms a voltage division of the first resistor and the third resistor, increasing the voltage of the comparison point between the first resistor and the third resistor.
[0007] Optionally, the hysteresis of the current comparison circuit is 120 mV, and the replenishment period is 2 ms.
[0008] According to another aspect of the present invention, there is provided a current comparison circuit, comprising: a reference current input terminal for receiving a reference current signal; a feedback current input terminal for receiving a feedback current signal; a current comparator, wherein the reference current input terminal is connected to the non-inverting input terminal of the current comparator via a first resistor, and the feedback current input terminal is connected to the inverting input terminal of the current comparator via a second resistor; wherein, a capacitor and a third resistor are connected between the non-inverting input terminal and the output terminal of the current comparator, the capacitor is connected between the non-inverting input terminal of the current comparator and the third resistor, and the other end of the third resistor is connected to the output terminal of the current comparator.
[0009] Optionally, the hysteresis of the current comparison circuit is 20 mV, and the replenishment period is 250 us.
[0010] 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 electrode 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 electrode 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, a reference current generation circuit and the above-mentioned current comparison circuit; 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 comparison circuit to provide a reference current signal to the current comparison circuit.
[0011] 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 electrode of the energy storage.
[0012] Optionally, a filtering module is further connected between the IGBT module 130 and the xenon lamp, and the filtering module is an LC filtering module composed of an inductor and a capacitor.
[0013] The advantages and positive effects of the present utility model are:
[0014] In this embodiment, a resistor R53 and an antiparallel diode D16 are connected between the positive input terminal and the output terminal of the current comparator U6. When the reference current at the reference current input terminal is greater than the feedback current at the feedback current input terminal, the current comparator U6 outputs a high level. At the same time, this high level will form a voltage division between the resistor R50 and the resistor R53 at the comparison point between the resistor R50 and the resistor R53, increasing the voltage at the comparison point between the resistor R50 and the resistor R53 by 3%. This improves the stability of the circuit comparison point.
[0015] In this embodiment, by replacing the antiparallel diode D16 with a capacitor C43, a non-differential system is formed. Description of the Drawings
[0016] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model and do not constitute a limitation to the present utility model. In the drawings:
[0017] Figure 1 Shows the structural diagram of the sorting belt energy storage power supply according to the first embodiment of the present application;
[0018] Figure 2 Shows the schematic structural diagram of the control board 110 according to the first embodiment of the present application;
[0019] Figure 3 Shows the circuit schematic diagram of the reference current generation circuit according to the first embodiment of the present application;
[0020] Figure 4 Shows the circuit schematic diagram of the current comparison circuit according to the first embodiment of the present application;
[0021] Figure 5 Shows the simulation schematic diagram of the current comparison current according to the first embodiment of the present application;
[0022] Figure 6 Shows the circuit schematic diagram of the current comparison circuit according to the second embodiment of the present application;
[0023] Figure 7 Shows the simulation schematic diagram of the current comparison current according to the second embodiment of the present application. Detailed Embodiment
[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0025] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a central component. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.
[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.
[0027] Figure 1 The structure diagram of the power supply for the sorting energy storage according to the first embodiment of the present application is shown in FIG. Figure 1 As shown, the sorting 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.
[0028] 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 via the reference voltage receiving terminal REF. The AC / DC boost inverter module 120 receives the mains (220V) voltage at its input terminal, 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 gate of the IGBT module 130.
[0029] In this embodiment, a diode 150 and an energy reservoir 140 are further provided. In this embodiment, the energy reservoir 140 is, for example, an electrolytic capacitor. The positive electrode of the energy reservoir 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 reservoir 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 reservoir. 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 reservoir. In this embodiment, a diode 150 is added between the AC / DC boost inverter module 120 and the energy storage 140 to prevent damage to the AC / DC boost inverter module 120 and energy backflow into the capacitor energy storage 140, thereby increasing power supply reliability and preventing fault expansion.
[0030] In this embodiment, a filter module 180 is further connected between the IGBT module 130 and the xenon lamp 160. The filter module 180 employs an LC filter module consisting 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 terminal of the xenon lamp 160, and the capacitor is connected between the first terminal and the second terminal of the xenon lamp 160.
[0031] Furthermore, the control board 110 is connected to the emitter and 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 toward the xenon lamp 160 .
[0032] Furthermore, 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 connected to the first terminal and the second terminal of the xenon lamp 160 respectively.
[0033] During operation, the energy reservoir 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 toward the xenon lamp 160. The discharge current of the IGBT module 130 is filtered by the LC filter module 180 and then provided to the xenon lamp 160. The discharge signal provided by the control board 110 to the IGBT module 130 is a pulse waveform. At a predetermined time (e.g., 500us) before each pulse discharge, the control board 110 applies pressure (e.g., to 20kV) to the trigger wire wound around the xenon lamp 160 through the trigger box 170, causing the xenon lamp 160 to form a pre-ionized plasma state, ready for discharge.
[0034] Figure 2The structure diagram of the control board 110 of the first embodiment of the present application is shown as follows: Figure 2 As shown, the control board 110 includes a single-chip microcomputer 111, a reference current generating circuit 112 connected to the single-chip microcomputer 111, and a current comparison circuit 113 connected to the reference current generating circuit 112. The single-chip microcomputer 111 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. The single-chip microcomputer 111 is also connected to the trigger box 170 to provide a trigger signal to the trigger box 170.
[0035] The reference current generating circuit 112 receives the light intensity reference signal and the light intensity feedback signal, and provides a current reference signal to the current comparing circuit 113 . Figure 3 FIG. 4 shows a circuit schematic diagram of a reference current generating circuit according to a first embodiment of the present application; FIG. Figure 3 As shown, the reference current generating circuit 112 includes a first input terminal, a second input terminal, and an operational amplifier U3A. The first input terminal of the reference current generating circuit 112 is connected to the single-chip microcomputer 111, and the single-chip microcomputer 111 provides a light intensity reference signal to the reference current generating circuit 112 via the first input terminal of the reference current generating circuit 112. The second input terminal receives a 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 generating circuit 112.
[0036] Furthermore, in this embodiment, a first input terminal of the reference current generating circuit 112 is connected to the non-inverting input terminal of the operational amplifier U3A, and a second input terminal is connected to the negative input terminal of the operational amplifier U3A via a resistor R42. An output terminal of the reference current generating circuit 112 is connected to the current comparator circuit 113 to provide a reference current signal to the current comparator circuit 113.
[0037] Figure 4 FIG. 4 shows a circuit schematic diagram of a current comparison circuit according to a first embodiment of the present application. Figure 4As shown, the current comparison circuit 113 includes a reference current input, a feedback current input, and a current comparator U6. The reference current input receives a reference current signal from the reference current generating circuit 112 and is connected to the positive phase input of the current comparator U6 via a resistor R50. The feedback current input is connected to the negative phase input of the current comparator U6 via a resistor R51. In one embodiment, the feedback current input is connected to the IGBT module 130 via a sampling circuit, for example. The sampling circuit samples the output current of the IGBT module 130 and feeds it back to the feedback current input. In other words, the feedback current input receives the output feedback current of the IGBT module 130. The output of the current comparator U6 is connected to the gate and emitter of the IGBT module 130 (Q1). The current comparator U6 receives the reference current signal and the feedback current signal and compares them. When the reference current signal is greater than the feedback current signal, the current comparator U6 provides a high level to the IGBT module 130, causing the IGBT module 130 to discharge. When the reference current signal is less than the feedback current signal, the current comparator U6 provides a low level to the IGBT module 130 , and the IGBT module 130 stops discharging.
[0038] Furthermore, in this embodiment, a resistor R53 and an anti-parallel diode D16 are connected between the non-inverting input terminal and the output terminal of the current comparator U6. Specifically, the resistor R53 is connected between the non-inverting input terminal of the current comparator U6 and the anode of the anti-parallel diode D16, and the cathode of the anti-parallel diode D16 is connected to the output terminal of the current comparator U6.
[0039] When the reference current at the reference current input terminal is greater than the feedback current at the feedback current input terminal, current comparator U6 outputs a high level. This high level simultaneously divides the voltage at the comparison point between resistors R50 and R53, increasing the voltage at the comparison point by 3%. Although this circuit maintains a stable comparison point, it does introduce a fixed static error.
[0040] Figure 5 FIG. 4 shows a simulation diagram of the current comparison current of the first embodiment of the present application, as shown in FIG. Figure 5 As shown, the green line is the reference current, the red line is the feedback current, the hysteresis is about 120 mV, and the replenishment period is 2ms.
[0041] Figure 6 FIG. 4 shows a circuit schematic diagram of a current comparison circuit according to a second embodiment of the present application. Figure 6As shown, different from the first embodiment, in this embodiment, a resistor R53 and a capacitor C43 are connected between the positive input terminal and the output terminal of the current comparator U6. Specifically, the capacitor C43 is connected between the positive input terminal of the current comparator U6 and the resistor R53, and the other end of the resistor R53 is connected to the output terminal of the current comparator U6.
[0042] Figure 7 Fig. shows the simulation schematic diagram of the current comparison current of the second embodiment of the present application. As Figure 7 shown, the green line is the reference current, the red line is the feedback current, the hysteresis is less than 20 mV, and the replenishment period is about 250 us. In this embodiment, by replacing the anti-parallel diode D16 with a capacitor C43, a non-differential system is formed.
[0043] The above has described the embodiments of the present invention in detail, but the content described is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. Any equal changes and improvements made within the scope of the present invention shall still fall within the scope covered by this patent.
Claims
1. A current comparison circuit, characterized in that, Comprising: A reference current input terminal for receiving a reference current signal; A feedback current input terminal for receiving a feedback current signal; A current comparator, wherein the reference current input terminal is connected to the non-inverting input terminal of the current comparator via a first resistor, and the feedback current input terminal is connected to the inverting input terminal of the current comparator via a second resistor; Wherein, a third resistor and an antiparallel diode are connected between the non-inverting input terminal and the output terminal of the current comparator, the third resistor is connected between the non-inverting input terminal of the current comparator and the anode of the antiparallel diode, and the cathode of the antiparallel diode is connected to the output terminal of the current comparator.
2. The current comparison circuit according to claim 1, wherein When the reference current at the reference current input terminal is greater than the feedback current at the feedback current input terminal, the current comparator outputs a high level; when the reference current at the reference current input terminal is less than the feedback current at the feedback current input terminal, the current comparator outputs a low level.
3. The current comparison circuit according to claim 2, wherein When the reference current at the reference current input terminal is greater than the feedback current at the feedback current input terminal, the current comparator outputs a high level, and a comparison point between the first resistor and the third resistor forms a voltage division of the first resistor and the third resistor, increasing the voltage of the comparison point between the first resistor and the third resistor.
4. The current comparison circuit according to claim 1, wherein The hysteresis of the current comparison circuit is 120 mV, and the replenishment period is 2 ms.
5. A current comparison circuit, characterized in that, Comprising: A reference current input terminal for receiving a reference current signal; A feedback current input terminal for receiving a feedback current signal; A current comparator, wherein the reference current input terminal is connected to the non-inverting input terminal of the current comparator via a first resistor, and the feedback current input terminal is connected to the inverting input terminal of the current comparator via a second resistor; Wherein, a capacitor and a third resistor are connected between the non-inverting input terminal and the output terminal of the current comparator, the capacitor is connected between the non-inverting input terminal of the current comparator and the third resistor, and the other end of the third resistor is connected to the output terminal of the current comparator.
6. The current comparison circuit according to claim 5, wherein The hysteresis of the current comparison circuit is 20 mV, and the replenishment period is 250 us.
7. 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 pole of the energy storage bank 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 bank 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, a reference current generation circuit, and the current comparison circuit according to any one of claims 1 to 6; The single-chip microcomputer is connected to the first input end of the reference current generation circuit, and provides a light intensity reference signal to the first input end of the reference current generation circuit. The output end of the reference current generation circuit is connected to the current comparison circuit, and provides a reference current signal to the current comparison circuit.
8. The sorting belt energy storage power supply according to claim 7, wherein It further includes a diode, and the diode is connected between the positive-phase output end of the AC / DC boost inverter module and the positive electrode of the energy storage bank.
9. The sorting belt energy storage power supply according to claim 7, characterized in that 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.