CN104655913A - Low-voltage fault judgment circuit and double power supply changeover switch controller - Google Patents
Low-voltage fault judgment circuit and double power supply changeover switch controller Download PDFInfo
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Abstract
The invention relates to a low-voltage fault judgment circuit and a double power supply changeover switch controller. The low-voltage fault judgment circuit comprises a voltage reduction module, a rectification module, a comparison module and an isolation module, wherein the voltage reduction module is used for respectively carrying out voltage reduction processing for three paths of voltages and respectively outputting the three paths of voltage-reduced voltages to the rectification module; the rectification module is used for rectifying the three paths of voltage-reduced voltages into three paths of direct voltages through alternating voltage and respectively outputting the three paths of direct voltages to the comparison module; the comparison module is used for respectively comparing the three paths of direct voltages with a preset internal reference voltage threshold VREF to output three paths of comparison signals; the comparison module is used for respectively outputting the three paths of comparison signals to the isolation module; the output end of the isolation module is connected with a signal feedback end U-FAULT, and the isolation module is used for isolating and sampling the three paths of comparison signals and outputting to the signal feedback end U-FAULT. The invention further provides the double power supply changeover switch controller comprising the low-voltage fault judgment circuit.
Description
Technical field
The present invention relates to Low Voltage Electrical Apparatus, particularly a kind of low voltage failure decision circuitry and the dual-power transfer switch controller comprising low voltage failure decision circuitry.
Background technology
Dual-power transfer switch electrical equipment is mainly used in as some important events such as smelting, chemical industry, hospital, government bodies, these important events power inleting terminals all adopt two-way or three-way power, when conventional power failure or when having a power failure, dual-power transfer switch will switch power supply to standby power supply, to ensure normal power supply.Whether existing Double-power controller voltage sampling circuit all needs to detect three-phase voltage normal, changes if there is the abnormal dual-power transfer switch that then controls.Existing several voltage sampling method comprises: voltage transformer (VT) is sampled, and the sampling of electric energy chip special chip and resistance and amplifier are sampled.Need conventional and each three-phase voltage of standby power supply be sampled and be judged respectively by single-chip microcomputer with top sampling method, need single-chip microcomputer sampled I/O mouth line more (6 A/D thief hatch lines), and affect judgement speed and actuation time, and manufacturing cost is high.If only to wherein one sample, then the fault of three-phase voltage can not be detected, defencive function is incomplete.
Summary of the invention
The object of the invention is to the defect overcoming prior art, provide a kind of structure simple, cost is low, low voltage failure decision circuitry and the dual-power transfer switch controller comprising low voltage failure decision circuitry of stable performance.
For achieving the above object, present invention employs following technical scheme:
A kind of low voltage failure decision circuitry, comprises voltage reduction module 1, rectification module 2, comparison module 3 and isolation module 4; The input end of described voltage reduction module 1 is connected with power supply N with power supply A phase, power supply B phase, power supply C phase, voltage reduction module 1 carries out step-down process to power supply A phase, power supply B phase and three road voltages between power supply C phase with power supply N phase respectively, and step-down Hou tri-road step-down voltage is exported to rectification module 2 respectively; The input end of described rectification module 2 is connected with the output terminal of voltage reduction module 1, and three road step-down voltages are become three tunnel DC voltage by ac voltage rectifier by rectification module 2; The output terminal of described rectification module 2 is connected with the input end of comparison module 3, and three tunnel DC voltage are exported to comparison module 3 respectively, and three tunnel DC voltage are compared output three road comparison signal with the internal reference voltage threshold VREF preset by comparison module 3 respectively; The output terminal of described comparison module 3 is connected with the input end of isolation module 4, three road comparison signals are exported to isolation module 4 respectively, the output terminal of isolation module 4 is connected with a road signal feedback end U-FAULT, and isolation module 4 carries out isolation to three road comparison signals and samples and output to a road signal feedback end U-FAULT.
Further, described voltage reduction module 1 comprises resistance R1, resistance R2, resistance R3, resistance R4, resistance R5 and resistance R6; One end of described R1 with R4 is connected with power supply N with power supply A phase respectively, and the other end is connected respectively to the input end of rectification module 2, and the A road step-down voltage after step-down is exported to rectification module 2; One end of described R2 with R5 is connected with power supply N with power supply B phase respectively, and the other end is connected respectively to the input end of rectification module 2, and the B road step-down voltage after step-down is exported to rectification module 2; One end of described R3 with R6 is connected with power supply N with power supply C phase respectively, and the other end is connected respectively to the input end of rectification module 2, and the C road step-down voltage after step-down is exported to rectification module 2.
Further, described rectification module 2 comprises rectifier bridge B1, rectifier bridge B2, rectifier bridge B3, filter capacitor C1, filter capacitor C2 and filter capacitor C3; The input end of rectifier bridge B1, rectifier bridge B2, rectifier bridge B3 is connected respectively with through voltage reduction module 1 step-down Hou tri-road step-down voltage, and output terminal is connected with comparison module 3 respectively; The positive pole of filter capacitor C1 and negative pole are connected with the three-prong of the output terminal of rectifier bridge B1 and the 4th pin respectively, the positive pole of filter capacitor C2 and negative pole are connected with the three-prong of the output terminal of rectifier bridge B2 and the 4th pin respectively, and the positive pole of filter capacitor C3 and negative pole are connected with the three-prong of the output terminal of rectifier bridge B3 and the 4th pin respectively.
Further, described comparison module 3 comprises resistance R7, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12, pull down resistor R13, pull down resistor R14, pull down resistor R15, electric capacity C4, electric capacity C5, electric capacity C6, voltage monitoring chip IC 1, voltage monitoring chip IC 2 and voltage monitoring chip IC 3, the three tunnel DC voltage that two ends after described resistance R7 connects with resistance R12 with resistance R10, resistance R11 with resistance R8, resistance R9 export with rectification module 2 are respectively connected, one end after described resistance R7 connects with resistance R8 is connected with the second pin of voltage monitoring chip IC 1 through pull down resistor R13, the other end is connected with the three-prong of voltage monitoring chip IC 1, R7 is connected with the first pin of voltage monitoring chip IC 1 with the intermediate node of resistance R8, the two ends of electric capacity C4 are connected with the first pin of voltage monitoring chip IC 1 and the three-prong of voltage monitoring chip IC 1 respectively, second pin of voltage monitoring chip IC 1 is connected with the input end of isolation module 4 respectively with the three-prong of voltage monitoring chip IC 1, A road comparison signal is exported to isolation module 4, one end after described resistance R9 connects with resistance R10 is connected with the second pin of voltage monitoring chip IC 2 through pull down resistor R14, the other end is connected with the three-prong of voltage monitoring chip IC 2, R9 is connected with the first pin of voltage monitoring chip IC 2 with the intermediate node of resistance R10, the two ends of electric capacity C5 are connected with the first pin of voltage monitoring chip IC 2 and the three-prong of voltage monitoring chip IC 2 respectively, second pin of voltage monitoring chip IC 2 is connected with the input end of isolation module 4 respectively with the three-prong of voltage monitoring chip IC 2, B road comparison signal is exported to isolation module 4, one end after described resistance R11 connects with resistance R12 is connected with the second pin of voltage monitoring chip IC 3 through pull down resistor R15, the other end is connected with the three-prong of voltage monitoring chip IC 3, R11 is connected with the first pin of voltage monitoring chip IC 3 with the intermediate node of resistance R12, the two ends of electric capacity C6 are connected with the first pin of voltage monitoring chip IC 3 and the three-prong of voltage monitoring chip IC 3 respectively, second pin of voltage monitoring chip IC 3 is connected with the input end of isolation module 4 respectively with the three-prong of voltage monitoring chip IC 3, C road comparison signal is exported to isolation module 4.
Further, described isolation module 4 comprises optocoupler P1, optocoupler P2, optocoupler P3 and pull-up resistor R16; The three road comparison signals that the input end of optocoupler P1, optocoupler P2 and optocoupler P3 exports with comparison module 3 are respectively connected; The output head anode of optocoupler P1 connects power supply VCC, the negative pole of output end of optocoupler P1 connects the output head anode of optocoupler P2, the negative pole of output end of optocoupler P2 connects the output head anode of optocoupler P3, and one end of pull-up resistor R16 is connected with optocoupler P3 negative pole of output end, other end ground connection; The negative pole of output end of optocoupler P3 is connected to a road signal feedback end U-FAULT.
A kind of dual-power transfer switch controller, comprise two above-mentioned low voltage failure decision circuitry and single-chip microcomputer, the input end of one of them low voltage failure decision circuitry is connected with conventional power supply, another input end is connected with standby power supply, and the output terminal of two low voltage failure decision circuitry is connected with two I/O mouth lines of single-chip microcomputer respectively.
The low voltage failure decision circuitry of dual-power transfer switch controller of the present invention, arranges voltage reduction module, rectification module respectively, comparison module and isolation module; Voltage reduction module exports three road step-down voltages to three tunnel voltage step-down process respectively, three road step-down voltages export three tunnel DC voltage through rectification module rectification, three tunnel DC voltage compare after process through comparison module and export three road comparison signals, three road comparison signals output to a road signal feedback end U-FAULT after isolation module isolation sampling, and signal feedback end U-FAULT is connected with single-chip processor i/o mouth line; Low voltage failure decision circuitry detects the three-phase voltage of power supply simultaneously, improve the reliability of controller, conventional power supply or standby power supply only need a single-chip microcomputer sampling A/D mouth line, the structure of dual-power transfer switch controller is simplified more, reduce production cost simultaneously, improve the judgement speed of single-chip microcomputer.
Accompanying drawing explanation
Fig. 1 is the structural representation of low voltage failure decision circuitry of the present invention.
Fig. 2 is the logical diagram of low voltage failure decision circuitry of the present invention.
Embodiment
Below in conjunction with the embodiment that accompanying drawing 1-2 provides, further illustrate the embodiment of dual-power transfer switch controller of the present invention.Dual-power transfer switch controller of the present invention is not limited to the description of following examples.
As shown in Figure 1, dual-power transfer switch controller of the present invention, comprises low voltage failure decision circuitry.Described low voltage failure decision circuitry comprises voltage reduction module 1, rectification module 2, comparison module 3 and isolation module 4; The input end of described voltage reduction module 1 is connected with power supply N with power supply A phase, power supply B phase, power supply C phase, voltage reduction module 1 carries out step-down process to power supply A phase, power supply B phase and three road voltages between power supply C phase with power supply N phase respectively, and step-down Hou tri-road step-down voltage is exported to rectification module 2 respectively; The input end of described rectification module 2 is connected with the output terminal of voltage reduction module 1, and three road step-down voltages are become three tunnel DC voltage by ac voltage rectifier by rectification module 2; The output terminal of described rectification module 2 is connected with the input end of comparison module 3, and three tunnel DC voltage are exported to comparison module 3 respectively, and three tunnel DC voltage are compared output three road comparison signal with the internal reference voltage threshold VREF preset by comparison module 3 respectively; The output terminal of described comparison module 3 is connected with the input end of isolation module 4, three road comparison signals are exported to isolation module 4 respectively, the output terminal of isolation module 4 is connected with a road signal feedback end U-FAULT, and isolation module 4 carries out isolation to three road comparison signals and samples and output to a road signal feedback end U-FAULT.The low voltage failure decision circuitry of dual-power transfer switch controller of the present invention, arranges voltage reduction module, rectification module respectively, comparison module and isolation module; Voltage reduction module exports three road step-down voltages to three tunnel voltage step-down process respectively, three road step-down voltages export three tunnel DC voltage through rectification module rectification, three tunnel DC voltage export three road comparison signals after comparison module compares process with the threshold value preset, three road comparison signals output to a road signal feedback end U-FAULT after isolation module isolation sampling, and signal feedback end U-FAULT is connected with single-chip processor i/o mouth line; Low voltage failure decision circuitry detects the three-phase voltage of power supply simultaneously, improve the reliability of controller, conventional power supply or standby power supply only need a single-chip microcomputer sampling A/D mouth line, the structure of dual-power transfer switch controller is simplified more, reduce production cost simultaneously, improve the judgement speed of single-chip microcomputer.The low voltage failure decision circuitry that two structures are identical is provided with in dual-power transfer switch controller, the input end of one of them low voltage failure decision circuitry is connected with conventional power supply, another input end is connected with standby power supply, the output terminal of two low voltage failure decision circuitry is connected with two I/O mouth lines of single-chip microcomputer respectively, can realize the detection to dual power supply low voltage failure.
As shown in Figure 1, voltage reduction module 1 carries out step-down process to power supply A phase, power supply B phase and three road voltages between power supply C phase with power supply N phase respectively and exports three road step-down voltages, namely the voltage between power supply A phase with power supply N phase exports A road step-down voltage after voltage reduction module 1 processes, voltage between power supply B phase with power supply N phase exports B road step-down voltage after voltage reduction module 1 step-down process, and the voltage between power supply C phase with power supply N phase exports C road step-down voltage after voltage reduction module 1 processes; A road step-down voltage, B road step-down voltage and C road step-down voltage export A road DC voltage respectively after rectification module 2 rectification, B road DC voltage and this three tunnels DC voltage of C road DC voltage; A road DC voltage, B road DC voltage and C road DC voltage export A road comparison signal respectively, B road comparison signal and this three roads comparison signal of C road comparison signal after comparison module 3 compares with the internal reference voltage threshold VREF preset respectively; A road comparison signal, B road comparison signal and C road comparison signal output to a road signal feedback end U-FAULT after isolation module 4 isolation sampling.
As shown in Figure 1, described voltage reduction module 1 comprises resistance R1, resistance R2, resistance R3, resistance R4, resistance R5 and resistance R6.One end of described R1 with R4 is connected with power supply N with power supply A phase respectively, and the other end is connected respectively to the input end of rectification module 2, and the A road step-down voltage after step-down is exported to rectification module 2; One end of described R2 with R5 is connected with power supply N with power supply B phase respectively, and the other end is connected respectively to the input end of rectification module 2, and the B road step-down voltage after step-down is exported to rectification module 2; One end of described R3 with R6 is connected with power supply N with power supply C phase respectively, and the other end is connected respectively to the input end of rectification module 2, and the C road step-down voltage after step-down is exported to rectification module 2.Voltage reduction module 1 forms series loop by resistance R1, resistance R2, resistance R3, resistance R4, resistance R5 and resistance R6 and carries out step-down process to power supply A phase, power supply B phase, voltage between power supply C phase with power supply N phase respectively.
As shown in Figure 1, described rectification module 2 comprises rectifier bridge B1, rectifier bridge B2, rectifier bridge B3, filter capacitor C1, filter capacitor C2 and filter capacitor C3.The input end of rectifier bridge B1, rectifier bridge B2, rectifier bridge B3 is connected respectively with through voltage reduction module 1 step-down Hou tri-road step-down voltage, and output terminal is connected with comparison module 3 respectively; The positive pole of filter capacitor C1 and negative pole are connected with the three-prong of the output terminal of rectifier bridge B1 and the 4th pin respectively, the positive pole of filter capacitor C2 and negative pole are connected with the three-prong of the output terminal of rectifier bridge B2 and the 4th pin respectively, and the positive pole of filter capacitor C3 and negative pole are connected with the three-prong of the output terminal of rectifier bridge B3 and the 4th pin respectively.Ac voltage rectifier after voltage reduction module 1 step-down is become DC voltage by rectification module 2.
As shown in Figure 1, described comparison module 3 comprises resistance R7, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12, pull down resistor R13, pull down resistor R14, pull down resistor R15, electric capacity C4, electric capacity C5, electric capacity C6, voltage monitoring chip IC 1, voltage monitoring chip IC 2 and voltage monitoring chip IC 3.The three tunnel DC voltage that two ends after described resistance R7 connects with resistance R12 with resistance R10, resistance R11 with resistance R8, resistance R9 export with rectification module 2 are respectively connected, one end after described resistance R7 connects with resistance R8 is connected with the second pin of voltage monitoring chip IC 1 through pull down resistor R13, the other end is connected with the three-prong of voltage monitoring chip IC 1, R7 is connected with the first pin of voltage monitoring chip IC 1 with the intermediate node of resistance R8, the two ends of electric capacity C4 are connected with the first pin of voltage monitoring chip IC 1 and the three-prong of voltage monitoring chip IC 1 respectively, second pin of voltage monitoring chip IC 1 is connected with the input end of isolation module 4 respectively with the three-prong of voltage monitoring chip IC 1, A road comparison signal is exported to isolation module 4, one end after described resistance R9 connects with resistance R10 is connected with the second pin of voltage monitoring chip IC 2 through pull down resistor R14, the other end is connected with the three-prong of voltage monitoring chip IC 2, R9 is connected with the first pin of voltage monitoring chip IC 2 with the intermediate node of resistance R10, the two ends of electric capacity C5 are connected with the first pin of voltage monitoring chip IC 2 and the three-prong of voltage monitoring chip IC 2 respectively, second pin of voltage monitoring chip IC 2 is connected with the input end of isolation module 4 respectively with the three-prong of voltage monitoring chip IC 2, B road comparison signal is exported to isolation module 4, one end after described resistance R11 connects with resistance R12 is connected with the second pin of voltage monitoring chip IC 3 through pull down resistor R15, the other end is connected with the three-prong of voltage monitoring chip IC 3, R11 is connected with the first pin of voltage monitoring chip IC 3 with the intermediate node of resistance R12, the two ends of electric capacity C6 are connected with the first pin of voltage monitoring chip IC 3 and the three-prong of voltage monitoring chip IC 3 respectively, second pin of voltage monitoring chip IC 3 is connected with the input end of isolation module 4 respectively with the three-prong of voltage monitoring chip IC 3, C road comparison signal is exported to isolation module 4.Comparison module 3 compares process to through rectification module 2 rectification Hou tri-tunnel DC voltage, exports three road comparison signals and is connected with the input end of isolation module 4.If A road DC voltage V1, B road DC voltage V2 and C road DC voltage voltage V3 is higher than the internal reference voltage threshold VREF of voltage monitoring chip IC 1, voltage monitoring chip IC 2 and voltage monitoring chip IC 3, and the output end voltage U3 of the output end voltage U1 of voltage monitoring chip IC 1, the output end voltage U2 of voltage monitoring chip IC 2 and voltage monitoring chip IC 3 is high level; If A road DC voltage V1, B road DC voltage V2 and C road DC voltage voltage V3 is lower than the internal reference voltage threshold VREF of voltage monitoring chip IC 1, voltage monitoring chip IC 2 and voltage monitoring chip IC 3, and the output end voltage U3 of the output end voltage U1 of voltage monitoring chip IC 1, the output end voltage U2 of voltage monitoring chip IC 2 and voltage monitoring chip IC 3 is low level.
As shown in Figure 1, described isolation module 4 comprises optocoupler P1, optocoupler P2, optocoupler P3 and pull-up resistor R16; The three road comparison signals that the input end of optocoupler P1, optocoupler P2 and optocoupler P3 exports with comparison module 3 are respectively connected; The output head anode of optocoupler P1 connects power supply VCC, the negative pole of output end of optocoupler P1 connects the output head anode of optocoupler P2, the negative pole of output end of optocoupler P2 connects the output head anode of optocoupler P3, and one end of pull-up resistor R16 is connected with optocoupler P3 negative pole of output end, other end ground connection; The negative pole of output end of optocoupler P3 is connected to a road signal feedback end U-FAULT.Isolation module 4 carries out isolation to three road comparison signals and samples and output to a road signal feedback end U-FAULT.
As shown in Figure 1-2, as the output end voltage U1 of voltage monitoring chip IC 1, when the output end voltage U2 of voltage monitoring the chip IC 2 and output end voltage U3 of voltage monitoring chip IC 3 is high level simultaneously, optocoupler P1, optocoupler P2, the conducting of optocoupler P3 input end photodiode, control optocoupler P1, optocoupler P2, the conducting of optocoupler P3 output terminal, so signal feedback end U-FAULT level is VCC high level in theory; As the output end voltage U1 of voltage monitoring chip IC 1, when the output end voltage U2 of voltage monitoring chip IC 2 and any one voltage of output end voltage U3 of voltage monitoring chip IC 3 are low level, any one output terminal not conducting of optocoupler P1, optocoupler P2, optocoupler P3, will make signal feedback end U-FAULT level be low level.In addition, signal feedback end U-FAULT is connected with single-chip processor i/o mouth line, judges that whether power supply three-phase voltage is normal by single-chip microcomputer.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (6)
1. a low voltage failure decision circuitry, is characterized in that: comprise voltage reduction module (1), rectification module (2), comparison module (3) and isolation module (4); The input end of described voltage reduction module (1) is connected with power supply N with power supply A phase, power supply B phase, power supply C phase, voltage reduction module (1) carries out step-down process to power supply A phase, power supply B phase and three road voltages between power supply C phase with power supply N phase respectively, and step-down Hou tri-road step-down voltage is exported to rectification module (2) respectively; The input end of described rectification module (2) is connected with the output terminal of voltage reduction module (1), and three road step-down voltages are become three tunnel DC voltage by ac voltage rectifier by rectification module (2); The output terminal of described rectification module (2) is connected with the input end of comparison module (3), three tunnel DC voltage are exported to comparison module (3) respectively, and three tunnel DC voltage are compared output three road comparison signal with the internal reference voltage threshold VREF preset by comparison module (3) respectively; The output terminal of described comparison module (3) is connected with the input end of isolation module (4), three road comparison signals are exported to isolation module (4) respectively, the output terminal of isolation module (4) is connected with a road signal feedback end U-FAULT, and isolation module (4) carries out isolation to three road comparison signals and samples and output to a road signal feedback end U-FAULT.
2. low voltage failure decision circuitry according to claim 1, is characterized in that: described voltage reduction module (1) comprises resistance R1, resistance R2, resistance R3, resistance R4, resistance R5 and resistance R6; One end of described R1 with R4 is connected with power supply N with power supply A phase respectively, and the other end is connected respectively to the input end of rectification module (2), and the A road step-down voltage after step-down is exported to rectification module (2); One end of described R2 with R5 is connected with power supply N with power supply B phase respectively, and the other end is connected respectively to the input end of rectification module (2), and the B road step-down voltage after step-down is exported to rectification module (2); One end of described R3 with R6 is connected with power supply N with power supply C phase respectively, and the other end is connected respectively to the input end of rectification module (2), and the C road step-down voltage after step-down is exported to rectification module (2).
3. low voltage failure decision circuitry according to claim 1, is characterized in that: described rectification module (2) comprises rectifier bridge B1, rectifier bridge B2, rectifier bridge B3, filter capacitor C1, filter capacitor C2 and filter capacitor C3; The input end of rectifier bridge B1, rectifier bridge B2, rectifier bridge B3 is connected respectively with through voltage reduction module (1) step-down Hou tri-road step-down voltage, and output terminal is connected with comparison module (3) respectively; The positive pole of filter capacitor C1 and negative pole are connected with the three-prong of the output terminal of rectifier bridge B1 and the 4th pin respectively, the positive pole of filter capacitor C2 and negative pole are connected with the three-prong of the output terminal of rectifier bridge B2 and the 4th pin respectively, and the positive pole of filter capacitor C3 and negative pole are connected with the three-prong of the output terminal of rectifier bridge B3 and the 4th pin respectively.
4. low voltage failure decision circuitry according to claim 1, is characterized in that: described comparison module (3) comprises resistance R7, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12, pull down resistor R13, pull down resistor R14, pull down resistor R15, electric capacity C4, electric capacity C5, electric capacity C6, voltage monitoring chip IC 1, voltage monitoring chip IC 2 and voltage monitoring chip IC 3, the three tunnel DC voltage that two ends after described resistance R7 connects with resistance R12 with resistance R10, resistance R11 with resistance R8, resistance R9 export with rectification module (2) are respectively connected, one end after described resistance R7 connects with resistance R8 is connected with the second pin of voltage monitoring chip IC 1 through pull down resistor R13, the other end is connected with the three-prong of voltage monitoring chip IC 1, R7 is connected with the first pin of voltage monitoring chip IC 1 with the intermediate node of resistance R8, the two ends of electric capacity C4 are connected with the first pin of voltage monitoring chip IC 1 and the three-prong of voltage monitoring chip IC 1 respectively, second pin of voltage monitoring chip IC 1 is connected with the input end of isolation module (4) respectively with the three-prong of voltage monitoring chip IC 1, A road comparison signal is exported to isolation module (4), one end after described resistance R9 connects with resistance R10 is connected with the second pin of voltage monitoring chip IC 2 through pull down resistor R14, the other end is connected with the three-prong of voltage monitoring chip IC 2, R9 is connected with the first pin of voltage monitoring chip IC 2 with the intermediate node of resistance R10, the two ends of electric capacity C5 are connected with the first pin of voltage monitoring chip IC 2 and the three-prong of voltage monitoring chip IC 2 respectively, second pin of voltage monitoring chip IC 2 is connected with the input end of isolation module (4) respectively with the three-prong of voltage monitoring chip IC 2, B road comparison signal is exported to isolation module (4), one end after described resistance R11 connects with resistance R12 is connected with the second pin of voltage monitoring chip IC 3 through pull down resistor R15, the other end is connected with the three-prong of voltage monitoring chip IC 3, R11 is connected with the first pin of voltage monitoring chip IC 3 with the intermediate node of resistance R12, the two ends of electric capacity C6 are connected with the first pin of voltage monitoring chip IC 3 and the three-prong of voltage monitoring chip IC 3 respectively, second pin of voltage monitoring chip IC 3 is connected with the input end of isolation module (4) respectively with the three-prong of voltage monitoring chip IC 3, C road comparison signal is exported to isolation module (4).
5. low voltage failure decision circuitry according to claim 1, is characterized in that: described isolation module (4) comprises optocoupler P1, optocoupler P2, optocoupler P3 and pull-up resistor R16; The three road comparison signals that the input end of optocoupler P1, optocoupler P2 and optocoupler P3 exports with comparison module (3) are respectively connected; The output head anode of optocoupler P1 connects power supply VCC, the negative pole of output end of optocoupler P1 connects the output head anode of optocoupler P2, the negative pole of output end of optocoupler P2 connects the output head anode of optocoupler P3, and one end of pull-up resistor R16 is connected with optocoupler P3 negative pole of output end, other end ground connection; The negative pole of output end of optocoupler P3 is connected to a road signal feedback end U-FAULT.
6. a dual-power transfer switch controller, it is characterized in that: comprise two as arbitrary in claim 1-5 as described in low voltage failure decision circuitry and single-chip microcomputer, the input end of one of them low voltage failure decision circuitry is connected with conventional power supply, another input end is connected with standby power supply, and the output terminal of two low voltage failure decision circuitry is connected with two I/O mouth lines of single-chip microcomputer respectively.
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CN110824380A (en) * | 2019-11-06 | 2020-02-21 | 科华恒盛股份有限公司 | Three-phase earth fault detection circuit and three-phase earth fault detection method |
CN113300610A (en) * | 2021-06-30 | 2021-08-24 | 佛山市顺德区美的电子科技有限公司 | Switching power supply circuit and household appliance |
CN113655743A (en) * | 2021-08-17 | 2021-11-16 | 北京计算机技术及应用研究所 | Power supply selection control circuit for automatic fault detection and repair |
CN113655743B (en) * | 2021-08-17 | 2023-03-10 | 北京计算机技术及应用研究所 | Power supply selection control circuit for automatic fault detection and repair |
CN114448075A (en) * | 2021-12-24 | 2022-05-06 | 深圳市德驰微视技术有限公司 | Protection circuit of on-vehicle image outage |
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