Circuit system for realizing storage battery power supply and alternating current power supply and power supply

Abstract

The invention provides a circuit system for realizing storage battery power supply and alternating current dual-power supply, which comprises a switching mechanism, an alternating current sampling unit, a switching signal unit and a charging inversion unit, and is characterized in that the switching mechanism connects the charging inversion unit with alternating current main power or alternating current standby power under the control of a main / standby switching signal, therefore, the charging inversion unit outputs alternating current to a rear-stage load; and under the condition that the alternating-current main power and the alternating-current standby power are abnormal, the charging inversion unit is connected with the storage battery and inverts and outputs alternating current to a rear-stage load. According to the scheme of the invention, the low-cost relay circuit is utilized to realize the switching of the main power and the standby power, and the existing charging and inversion all-in-one machine is utilized to supply power to the post-stage load, so that the power supply capability of the system is greatly improved, and the high-reliability requirements of electric equipment in some places are met.

Description

Technical Field

[0001] The present disclosure relates to the field of mining power supplies, and in particular to a circuit system and a power supply that realizes dual power supply of a battery and an alternating current. Background Art

[0002] In industrial power supply systems, dual power supply can provide high reliability power supply to power-consuming equipment. In some scenarios, some power-consuming equipment needs to be powered by batteries to improve the power supply quality.

[0003] Taking the coal mining industry as an example, with the development of intelligent mining in my country, the power supply quality requirements of underground power supply sites in coal mines are becoming more and more stringent. Important power-consuming equipment uses dual power supplies, and underground power monitoring, communication and other equipment use flameproof and intrinsically safe battery power supplies. If the battery power supply has the ability to supply AC dual power supplies, it can further guarantee the power supply quality of the power-consuming equipment in the site.

[0004] Since there are no industrial application examples of this type of power supply solution, it is of great significance to design a power supply system that can provide AC dual power supply and battery power supply to the load. Summary of the invention

[0005] The present invention provides a circuit system and a power supply for realizing a battery power supply and an AC dual power supply, and is used to solve the problem that the battery power supply cannot provide an AC dual power supply.

[0006] To solve the above technical problems, the present invention is achieved as follows:

[0007] On the one hand, the present invention provides a circuit system for realizing battery power supply and AC dual power supply, the system includes a switching mechanism, an AC sampling unit, a switching signal unit and a charging inverter unit, wherein:

[0008] The two input ends of the switching mechanism are respectively connected to the AC main power and the AC backup power, the output end is connected to the input end of the charging inverter, and the signal end is connected to the signal output of the switching signal unit;

[0009] The charging port and the discharging port of the charging inverter unit are connected to the charging port and the discharging port of the battery respectively, and the output terminal of the charging inverter unit is connected to the subsequent load;

[0010] The input end of the AC sampling unit is connected to the AC main power, and is used to convert the AC voltage into a main power DC sampling voltage output;

[0011] The switching signal unit takes the main power DC sampling voltage as input and generates a main-standby switching signal after comparing it with the reference voltage;

[0012] Under the control of the main-standby switching signal, the switching mechanism connects the charging inverter unit to the AC main power or the AC backup power so that the charging inverter unit outputs AC power to the subsequent load; when both the AC main power and the AC backup power are abnormal, the charging inverter unit is connected to the battery and inverts and outputs AC power to the subsequent load.

[0013] On the other hand, the present invention provides a battery power supply with AC dual power supply capability, the power supply comprising: a battery, and the aforementioned circuit system for realizing battery power supply and AC dual power supply.

[0014] On the other hand, the present invention provides a mine-use explosion-proof and intrinsically safe battery power supply, which includes: an explosion-proof battery cavity, an explosion-proof equipment cavity, a battery, and the aforementioned circuit system for realizing battery power supply and AC dual power supply; wherein the battery is placed in the explosion-proof battery cavity, and the circuit system is placed in the explosion-proof equipment cavity.

[0015] The technical solution of the present invention utilizes the existing circuit elements and low-cost relay control circuit in the battery power supply circuit, and through simple circuit design, enables the battery to have the ability to supply power with AC main and standby dual power supplies. When the AC main and standby power supplies are normal, AC power supply is given priority, and battery power is not consumed. When the AC main power is abnormal, it switches to the AC standby power. When both the AC main and standby power are abnormal, the battery supplies power. The gaps in the AC main and standby power switching process are also connected by the battery, and no voltage drop occurs. The implementation of the solution of the present invention will not significantly increase the cost of the original battery power supply. The low-cost relay circuit is used to realize the switching of the main and standby power, and the existing charging inverter is used to supply power to the subsequent load, which greatly improves the power supply capacity of the system and meets the high reliability requirements of electrical equipment in some places. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the circuit system structure for realizing battery power supply and AC dual power supply provided in an embodiment of the present disclosure;

[0018] Figure 2 is a circuit schematic diagram of an AC sampling unit in an embodiment of the present disclosure;

[0019] Figure 3is a circuit schematic diagram of a switching signal unit in an embodiment of the present disclosure;

[0020] Figure 4 is a circuit schematic diagram of a switching mechanism in an embodiment of the present disclosure;

[0021] Figure 5 is a circuit schematic diagram of a charging inverter unit in an embodiment of the present disclosure;

[0022] Figure 6 is a circuit schematic diagram of an AC power supply unit in an embodiment of the present disclosure;

[0023] Figure 7 is a circuit schematic diagram of a battery power supply unit in an embodiment of the present disclosure;

[0024] Figure 8 It is a circuit diagram of an implementation scheme of the AC power supply unit in the embodiment of the present disclosure. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solutions in the present disclosure, the technical solutions of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present disclosure. In addition, for the sake of clarity, parts that are not related to the description of the exemplary embodiments are omitted in the drawings.

[0026] In this specification, it should be understood that terms such as "including" or "having" are intended to indicate the existence of the features, numbers, steps, behaviors, components, parts or combinations thereof disclosed in the present disclosure, and are not intended to exclude the possibility that one or more other features, numbers, steps, behaviors, components, parts or combinations thereof exist or are added. It should also be noted that the embodiments in the present disclosure and the features in the embodiments may be combined with each other if there is no conflict.

[0027] Figure 1 A schematic diagram of the structure of a circuit system that implements battery power supply and AC dual power supply according to an embodiment of the present disclosure.

[0028] like Figure 1 As shown, the circuit system includes a switching mechanism 01, an AC sampling unit 02, a switching signal unit 03 and a charging inverter unit 04. The battery is an existing module, and the AC main power and AC backup power are AC inputs.

[0029] Figure 1In the invention, the two input ends of the switching mechanism are respectively connected to the AC main power and the AC backup power, the output end is connected to the input end of the charging inverter unit, and the signal end is connected to the signal output of the switching signal unit. The charging port and the discharging port of the charging inverter unit are correspondingly connected to the charging and discharging ports of the battery, and the output end of the charging inverter unit is connected to the subsequent load. The input end of the AC sampling unit is connected to the AC main power, and is used to convert the AC voltage into the main power DC sampling voltage output; the switching signal unit takes the main power DC sampling voltage as input, and generates the main-backup switching signal after comparing it with the reference voltage.

[0030] Under the control of the main-standby switching signal, the switching mechanism connects the charging inverter unit to the AC main power or the AC backup power, so that the charging inverter unit outputs AC power to the subsequent load; when both the AC main power and the backup power are abnormal, the charging inverter unit is connected to the battery and inverts and outputs AC power to the subsequent load.

[0031] The switching signal unit requires a DC voltage supply for normal operation, and the working voltage can be obtained from the AC input. To this end, the circuit system may also include an AC power supply unit 05. The AC power supply unit is used to convert the AC voltage output by the switching mechanism into a DC working voltage adapted to the switching signal unit and output it. The output end of the AC power supply unit is connected to the power supply end of the switching signal unit via a diode D1. Diode D1 can isolate reverse current to prevent the formation of a reverse loop and damage to circuit components. When connected, the anode of D1 is connected to the output end of the AC power supply unit, and the cathode is connected to the power supply input end of the switching signal unit.

[0032] The working voltage of the switching signal unit can also be powered by a battery. When both the main power and the backup power lose voltage, there is no AC output at the output end of the switching mechanism. At this time, the circuit system can also be powered by a battery. If the battery terminal voltage matches the working voltage of the switching signal unit, it can be directly connected to the power supply end of the switching signal unit through the diode D2; if the battery voltage does not match the working voltage of the switching signal unit, the battery needs to be combined with a DC / DC module to supply power to the switching signal unit.

[0033] When the battery voltage does not match the operating voltage of the switching signal unit, Figure 1 The circuit system shown may also include a battery power supply unit 06. The battery power supply unit is used to convert the group terminal voltage of the battery into a DC working voltage adapted to the switching signal unit and output it. The input end of the battery power supply unit is connected to the battery to obtain the group terminal voltage, and the output end is connected to the power supply end of the switching signal unit through a diode D2. The diode D2 can isolate the reverse current to prevent the formation of a reverse loop and damage to the circuit components. When connected, the anode of D2 is connected to the output end of the battery, and the cathode is connected to the power supply input end of the switching signal unit.

[0034] like Figure 1As shown, the charging end of the charging inverter unit 04 is connected to the charging end of the battery through the diode D3, and the discharging end of the battery is connected to the discharging end of the charging inverter unit through the diode D4. When connected, the anode of D3 is connected to the charging port of the charging inverter unit, and the cathode is connected to the charging port of the battery; the anode of D4 is connected to the discharging port of the battery, and the cathode is connected to the discharging port of the charging inverter unit. The role of diodes D3 and D4 is also reverse isolation.

[0035] The circuit system provided by the embodiment of the present disclosure is described in detail below in conjunction with the circuit principle diagrams of each unit module.

[0036] (1) AC sampling unit

[0037] Figure 2 4 is a circuit diagram of an AC sampling unit in an embodiment of the present disclosure.

[0038] like Figure 2 As shown, the AC sampling unit is composed of a rectifier bridge Z1, resistors RZ1, RZ2, RZ3, RZ4 and filter capacitors CZ1 and CZ2.

[0039] The ACL1 terminal of the AC main power is connected to pin 1 of resistor RZ1, and pin 2 of resistor RZ1 is connected to pin 1 of rectifier bridge Z1; the ACN1 terminal of the AC main power is connected to pin 1 of resistor RZ2, and pin 2 of resistor RZ2 is connected to pin 2 of rectifier bridge Z1; capacitors CZ1 and CZ2 are connected in parallel and connected to pin 3 (positive end) and pin 4 (negative end) of rectifier bridge Z1 respectively; resistors RZ3 and RZ4 are connected in series and then connected in parallel with CZ2.

[0040] The AC voltage of the main power is stepped down by resistors RZ1 and RZ2, and then connected to the rectifier bridge Z1 for rectification. The rectified pulse voltage is filtered by capacitors CZ1 and CZ2 to form a DC voltage. After the sampling resistors RZ3 and RZ4 pressurize, a current is formed in the resistor RZ1, RZ2, RZ3, and RZ4 loop. The voltage drop of this current on the resistor RZ4 is the sampling voltage Vs.

[0041] (2) Switching signal unit

[0042] Figure 3 4 is a circuit schematic diagram of a switching signal unit in an embodiment of the present disclosure.

[0043] like Figure 3 As shown, the switching signal unit is a window comparator composed of operational amplifiers A1 and A2, resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10 and diodes D7 and D8.

[0044] Resistors R7 and R8 are connected in series to form a voltage divider circuit, forming a reference voltage VCC / 2+VR at point C as the reference voltage input of the comparator formed by operational amplifier A1; resistors R9 and R10 are connected in series to form a voltage divider circuit, forming a reference voltage VCC / 2-VR at point D as the reference voltage input of the comparator formed by operational amplifier A2.

[0045] Resistors R1, R2, R3 and op amp A1 form an upper window comparator circuit. One end of resistor R1 is connected to point C, and the other end is connected to the inverting input pin 2 of op amp A1; one pin of resistor R2 is connected to point H, and the other end is connected to the positive input pin 3 of op amp A1; R3 is connected to the positive input pin 3 and output pin 1 of op amp A1 respectively. When the voltage at point H is higher than VCC / 2+VR, op amp A1 outputs a high level; when the voltage at point H is lower than VCC / 2+VR, op amp A1 outputs a low level.

[0046] Resistors R4, R5, R6 and op amp A2 form a lower window comparison circuit. One end of resistor R4 is connected to point H, and the other end is connected to the inverting input pin 2 of op amp A2; one pin of resistor R5 is connected to point D, and the other end is connected to the positive input pin 3 of op amp A2; R6 is connected to the positive input pin 3 and output pin 1 of op amp A2 respectively. When the voltage at point H is higher than VCC / 2-VR, op amp A2 outputs a low level; when the voltage at point H is lower than VCC / 2-VR, op amp A2 outputs a high level.

[0047] The anode of diode D7 is connected to the output terminal 1 of operational amplifier A1, and the cathode is connected to point K; the anode of diode D8 is connected to the output terminal 1 of operational amplifier A2, and the cathode is connected to point K. The output signals of operational amplifier A1 and operational amplifier A2 are ORed to form a master-slave switching signal to control switching mechanism 6 to switch the master-slave power supply. When the AC main power supply is normal, when the anodes of D7 and D8 are both applied with a low level, the master-slave switching signal is a low level, and no switching occurs. When the AC main power supply is abnormal, one of the anodes of D7 and D8 is applied with a high level, the master-slave switching signal is a high level, and the AC backup power is switched.

[0048] (3) Switching mechanism

[0049] Figure 4 4 is a circuit diagram of the switching mechanism in the embodiment of the present disclosure.

[0050] like Figure 4 As shown, the switching mechanism is implemented by an optocoupler GD1, a diode D6, a transistor T1, resistors R11, R12, R13 and a relay Q1.

[0051] One end of the resistor R11 is connected to the K point of the switching signal unit, and the other end is connected to the anode (pin 1) of the light emitting diode of the optocoupler GD1; the cathode (pin 2) of the light emitting diode of the optocoupler GD1 is connected to the power supply GND, the collector (pin 4) of the phototransistor of the optocoupler GD1 is connected to the power supply VCC, and the emitter (pin 3) of the phototransistor of the optocoupler GD1 is connected to one end of the resistor R12; the other end of the resistor R12 is connected to the base of the transistor T1, the resistor R13 is connected in parallel to the base and emitter of the transistor T1, and the common end of the emitter of the transistor T1 and the resistor R13 is connected to the power supply GND. The freewheeling diode D6 is connected in parallel to the two ends of the coil L1 of the relay Q1, the collector of the transistor T1 is connected to the anode of the diode D6 and the common end of the coil L1, and the cathode of the diode D6 and the common end of the coil L1 are connected to the power supply VCC.

[0052] Relay Q1 is a double-pole double-throw relay, with S1 as the first contact and S2 as the second contact. The common terminal 1 pin of contact S1 is connected to ACL, the normally open point 2 pin of contact S1 is connected to the L terminal of the backup power ACL2, the normally closed point 3 pin of contact S1 is connected to the L terminal of the AC main power ACL1, and contact S1 controls the L terminal of the AC power; the common terminal 1 pin of contact S2 is connected to ACN, the normally open point 2 pin of contact S2 is connected to the N terminal ACN2 of the AC backup power, the normally closed point 3 pin of contact S2 is connected to the N terminal ACN1 of the AC main power, and S2 controls the N terminal of the AC power. When the main-standby switching signal is at a low level, the transistor of the optocoupler GD1 is not turned on, the relay Q1 does not operate, and the AC main power is connected. When the main-standby switching signal is at a high level, the transistor of the optocoupler GD1 is turned on, the relay Q1 operates, and the AC backup power is connected.

[0053] (4) Charging inverter unit

[0054] Figure 5 4 is a circuit diagram of a charging inverter unit in an embodiment of the present disclosure.

[0055] like Figure 5 As shown, the charging inverter unit includes an AC / DC module, a DC / AC module, a bidirectional DC / DC module and a conversion switch. The charging inverter unit can be a charging inverter all-in-one machine.

[0056] The AC input provided by the switching mechanism outputs an AC voltage after passing through the AC / DC module, the DC / AC module and the conversion switch; the bidirectional DC / DC module is connected to the charging and discharging ports of the battery, and draws power from the output of the AC / DC module, charges the battery when the battery is undervoltage, and inverts the DC power of the battery into AC output when the AC input is abnormal.

[0057] The charging inverter unit has an AC input terminal, an AC output terminal, a charging port, and a discharging port. The charging port is connected to the anode of diode D3, and the cathode of diode D3 is connected to the charging port of the battery. When the battery is undervoltage, the battery is charged; the discharging port is connected to the cathode of diode D4, and the anode of diode D4 is connected to the discharging port of the battery. When the voltage at the AC input terminal is abnormal, the charging inverter unit turns on the inverter function to convert the battery DC voltage into AC voltage to power the subsequent load.

[0058] (5) AC power supply unit

[0059] Figure 6 A circuit schematic diagram of an AC power supply unit in an embodiment of the present disclosure.

[0060] like Figure 6 As shown, the AC power supply unit includes a rectifier bridge Z2, capacitors C1, C2 and a DC / DC module DY1.

[0061] Pin 1 of the rectifier bridge Z2 is connected to the AC output terminal ACL of the switching mechanism, pin 2 of the rectifier bridge Z2 is connected to the AC output terminal ACN of the switching mechanism, and the filter capacitors C1 and C2 are connected in parallel to pins 3 and 4 of the rectifier bridge Z2. The input end of the DC / DC module DY1 is connected to both ends of the capacitor C2, and the output end of the DC / DC module DY1 is V1.

[0062] The output voltage of the switching mechanism is rectified by the rectifier bridge Z2 and filtered by the capacitors C1 and C2, and then converted into the supply voltage V1 by the DC / DC module DY1.

[0063] (6) Battery powered unit

[0064] Figure 7 A circuit schematic diagram of a battery power supply unit in an embodiment of the present disclosure.

[0065] like Figure 7 As shown, the battery power supply unit 06 includes a DC / DC module DY3, capacitors C3, C4, and is connected to the original battery pack BAT.

[0066] The positive electrode VB+ of the battery pack BAT is connected to the positive input terminal IN+ of the DC / DC module DY3, and the negative electrode of the battery pack BAT is connected to the negative input terminal IN- of the DC / DC module DY3; the filter capacitors C3 and C4 are connected in parallel to the positive output terminal VO+ and the negative output terminal VO- of the DC / DC module DY3. The voltage VB+ of the battery pack BAT is converted into the voltage V2 by the DC / DC module DY3 to supply power to the switching signal unit.

[0067] The working principle of the circuit system is explained below from the two perspectives of power supply to the subsequent load and power supply to the internal.

[0068] (1) Power supply to downstream loads

[0069] After the battery power supply is connected to the circuit system, there are the following four power supply situations: normal AC main power supply, loss of voltage or low voltage of the AC main power supply, high voltage of the AC main power supply, and normal recovery of the AC main power supply.

[0070] In the first situation, the AC main power supply (power supply terminals ACL1, ACN1) supplies power normally, and the supply voltage V satisfies Vh - Vr < V < Vh + Vr, where Vh is the rated line voltage and Vr is the allowable line deviation voltage.

[0071] At this time, the AC sampling unit rectifies and filters the voltage of the AC main power supply and outputs a sampled voltage Vs. Since the supply voltage V is normal, Vs fluctuates within a certain range. Select appropriate RZ3 and RZ3 values so that VCC / 2 - VR < Vs < VCC / 2 + VR.

[0072] The sampled voltage Vs ( Figure 3 the voltage at point H) generates a low level after being compared with the reference voltage of A1 of the switching signal unit; the sampled voltage Vs also generates a low level after being compared with the reference voltage of A2 of the switching signal unit. Figure 3 Low levels are applied to the anodes of D7 and D8 in Figure 4 the triode of the optocoupler GD1 in

[0073] does not conduct, the relay Q1 does not operate, and the AC main power supply (power supply terminals ACL1, ACN1) is connected to the output terminals (ACL, ACN) to supply power to the subsequent load.

[0074] In the second situation, when the AC main power supply loses voltage or is at low voltage, both can be classified as V < Vh - Vr. Figure 3 At this time, the sampled voltage Vs of the AC sampling unit < VCC / 2 - VR. The sampled voltage Vs generates a low level after being compared with the reference voltage of A1 of the switching signal unit; the sampled voltage Vs generates a high level after being compared with the reference voltage of A2 of the switching signal unit. Figure 4 In

[0075] a high level is applied to the anode of D8,

[0076] the triode of the optocoupler GD1 conducts, the relay Q1 operates, the AC main power supply (power supply terminals ACL1, ACN1) is disconnected from the output terminals (ACL, ACN), and the AC backup power supply (power supply terminals ACL2, ACN2) is connected to the output terminals (ACL, ACN) to supply power to the subsequent load. Figure 4In the circuit, a high level is applied to the anode of D7, the transistor of the optocoupler GD1 is turned on, the relay Q1 is activated, the main power supply (power supply end ACL1, ACN1) is disconnected from the output end (ACL, ACN), and the backup power supply (power supply end ACL2, ACN2) is connected to the output end (ACL, ACN) to supply power to the subsequent load.

[0077] In the fourth case, the main power supply returns to normal, and the sampling voltage of the AC sampling unit is VCC / 2-VR <Vs<VCC / 2+VR。

[0078] At this time, the sampling voltage Vs generates a low level after being compared with the reference voltage A1 of the switching signal unit; the sampling voltage Vs also generates a low level after being compared with the reference voltage A2 of the switching signal unit. Figure 4 In the circuit, the anodes of D3 and D4 are both applied with low level, the transistor of the optocoupler GD1 is not turned on, the relay Q1 does not work, and the main power supply (power supply terminal ACL1, ACN1) and the output terminal (ACL, ACN) are connected to supply power to the subsequent load.

[0079] (2) Power supply to the switching signal unit and switching mechanism

[0080] When the AC main power is normal, the switching signal unit and the switching mechanism are powered by the AC main power. Otherwise, the AC backup power is used to supply power. When both the AC main power and the backup power are abnormal, the battery is used to supply power.

[0081] When the voltage of the AC main power is normal, the main power (power supply terminals ACL1, ACN1) is connected to the output terminals (ACL, ACN), and the AC power supply unit generates voltage V1 through rectification, filtering, and voltage stabilization, and supplies power to the switching signal unit and the switching mechanism through diode D1. When the voltage of the AC main power is abnormal, the AC backup power (power supply terminals ACL2, ACN2) is connected to the output terminals (ACL, ACN), and the AC power supply unit generates voltage V1 through rectification and filtering, and supplies power to the switching signal unit and the switching mechanism through diode D1.

[0082] When both the AC main power and the backup power are abnormal, the output voltage V2 of the battery power supply unit is used to power the switching signal unit and the switching mechanism after passing through the diode D2. The switching signal unit and the switching mechanism work normally. At this time, the AC backup power (power supply terminal ACL2, ACN2) is connected to the output terminal (ACL, ACN) to prevent the control circuit from generating an unstable state when the AC power is received, causing the relay to switch randomly and reduce the life of the relay.

[0083] In addition, during the switching process between the AC main power and the backup power, if there is a switching gap, the voltage V1 will drop. At this time, the power supply voltage V2 of the battery power supply unit will continue to be supplied by the voltage V1, thereby improving the switching reliability.

[0084] The output voltage V2 of the battery power supply unit should be slightly lower than the output voltage V1 of the AC power supply unit. This ensures that when at least one of the AC main power and the backup power is normal, the AC power supply is used first and the battery power is not consumed.

[0085] The working principle of the circuit system provided by the embodiment of the present disclosure has been described above. Now, a specific implementation plan is given for the selection of key components in the circuit system.

[0086] (1) Implementation scheme of AC sampling unit 02: resistors RZ1 and RZ2 are 130K, package 2512, 2W; rectifier bridge Z1 is MB10F, capacitor CZ1 is 100n / 50V, CZ2 is 4.7uF / 50V; resistor RZ3 is 10K, package 0805 0.25W; resistor RZ4 is 5.6K, package 0805 0.25W.

[0087] (2) The AC power supply unit 05 uses a mature AC / DC module that integrates rectification, filtering, and DC / DC. The specific model is HLK-PM05, with an input of AC100-240V, an output of DC5V 250mA, and a power of 3W. Figure 8 The figure is a circuit connection diagram of the AC power supply unit, where filter capacitors C1 and C2 are connected in parallel to the output end of the module, capacitor C1 is 10uF 25V, and capacitor C2 is 100nF 25V.

[0088] (3) The battery connected to the battery power supply unit 06 can be 24 strings of 3.2V 60AH lithium iron phosphate batteries, and the DC / DC module uses Hailingke URB1D05_YMD-5WR3, with an input voltage of DC40-160V, an output voltage of DC5V, a power of 5W, a filter capacitor C3 of 10uF25V, and a capacitor C4 of 100nF 25V.

[0089] (4) The charging inverter unit 04 uses an integrated charging inverter, model ITA-03K00AL1102C00, input AC185-265V, output AC220V 50Hz, output power 3KV, and battery voltage 72V.

[0090] (5) Implementation scheme of switching signal unit 03: resistors R1, R2, R4, R5, and R7 are 10K packaged 0805; resistor R3 is 130K packaged 0805; resistor R6 is 200K packaged 0805; resistor R8 is 14K packaged 0805; resistor R9 is 2.4K packaged 0805; resistor R10 is 12K packaged 0805; operational amplifiers A1 and A2 use dual operational amplifiers GS8552; diodes D7 and D8 are 1N4148 SOD-323.

[0091] (6) Implementation scheme of switching mechanism 01: resistors R11 and R12 are 2.2K package 0805; optocoupler GD1 model is TLP127IC 150mA Vceo 300V; relay is Hongfa HF115F / 005-2ZS48A@250V coil voltage 5V, diode D6 is 1N4007; resistor R13 is 10K package 0805.

[0092] In summary, the solution provided by the embodiment of the present disclosure utilizes the existing circuit elements and low-cost relay control circuit in the battery power supply circuit. Through simple circuit design, the battery has the ability to supply power with AC main and backup dual power supplies. When the AC main and backup power supplies are normal, AC power supply is prioritized and battery power is not consumed. When the AC main power is abnormal, it switches to the AC backup power. When both the AC main and backup power are abnormal, the battery supplies power. The gaps in the AC main and backup power switching process are also connected by the battery, and no voltage drop occurs. The implementation of the solution of the present invention will not significantly increase the cost of the original battery power supply. The main and backup power switching is realized by using a low-cost relay circuit, and the existing charging inverter is used to supply power to the subsequent load, which greatly improves the power supply capacity of the system and meets the reliability requirements of electrical equipment in some places.

[0093] Based on the same inventive concept, the present disclosure also provides a battery power supply with AC dual power supply capability, which includes a battery and the aforementioned circuit system for realizing battery power supply and AC dual power supply. For example, the existing battery is improved, and an interface between the circuit and the AC main and standby power supply is added. The circuit is used to carry the aforementioned circuit system, so that the battery has the ability of AC dual power supply, and its application range is increased.

[0094] The present disclosure also provides a mine-use flameproof and intrinsically safe battery power supply, which includes a flameproof battery chamber, a flameproof equipment chamber, a battery, and a circuit system for realizing battery power supply and AC dual power supply as described above; wherein the battery is placed in the flameproof battery chamber, and the circuit system is placed in the flameproof equipment chamber. The battery meets the intrinsic safety requirements for mine use, and such a mine-use flameproof and intrinsically safe battery power supply not only meets safety specifications but also increases power supply reliability.

[0095] The above description is only an embodiment of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the scope of the claims of the present disclosure.

Claims

1. A circuit system that realizes dual power supply of battery power supply and AC power supply, characterized in that: It includes a switching mechanism, an AC sampling unit, a switching signal unit and a charging inverter unit, wherein: The two input ends of the switching mechanism are respectively connected to the AC main power and the AC backup power, the output end is connected to the input end of the charging inverter, and the signal end is connected to the signal output of the switching signal unit; The charging port and the discharging port of the charging inverter unit are connected to the charging port and the discharging port of the battery respectively, and the output terminal of the charging inverter unit is connected to the subsequent load; The input end of the AC sampling unit is connected to the AC main power, and is used to convert the main power AC voltage into a main power DC sampling voltage output; The switching signal unit takes the main power DC sampling voltage as input and generates a main-standby switching signal after comparing it with the reference voltage; Under the control of the main-standby switching signal, the switching mechanism connects the charging inverter unit to the AC main power or the AC backup power so that the charging inverter unit outputs AC power to the subsequent load; when both the AC main power and the AC backup power are abnormal, the charging inverter unit is connected to the battery and inverts and outputs AC power to the subsequent load.

2. The circuit system according to claim 1, characterized in that: The circuit system also includes an AC power supply unit, which is used to convert the AC voltage output by the switching mechanism into a DC working voltage adapted to the switching signal unit and output it. The output end of the AC power supply unit is connected to the power supply end of the switching signal unit via a diode D1.

3. The circuit system according to claim 1, characterized in that: The circuit system also includes a battery power supply unit, which is used to convert the group terminal voltage of the battery into a DC working voltage adapted to the switching signal unit for output, and the output end of the battery power supply unit is connected to the power supply end of the switching signal unit via a diode D2.

4. The circuit system according to claim 1, characterized in that: The charging port of the charging inverter unit is connected to the charging end of the battery via a diode D3, and the discharging port of the charging inverter unit is connected to the discharging end of the battery via a reverse diode D4.

5. The circuit system according to claim 1, characterized in that: The AC sampling unit includes a rectifier bridge Z1, resistors RZ1, RZ2, RZ3, RZ4 and filter capacitors CZ1 and CZ2. The AC voltage of the AC main power is stepped down by the resistors RZ1 and RZ2, and then connected to the rectifier bridge Z1 for rectification. The rectified pulse voltage is filtered by the capacitors CZ1 and CZ2 to form a DC voltage, which is pressurized by the resistors RZ3 and RZ4 to obtain a sampling voltage Vs on the resistor RZ4.

6. The circuit system according to claim 2, characterized in that: The AC power supply unit includes a rectifier bridge Z2, capacitors C1, C2 and a DC / DC module DY1. The AC voltage output by the switching mechanism is rectified by the rectifier bridge Z2, filtered by the capacitors C1, C2, and then converted into a power supply voltage V1 by the DC / DC module DY1.

7. The circuit system according to claim 3, characterized in that: The battery power supply unit includes a DC / DC module DY3, capacitors C3, C4, and the battery terminal voltage is converted by the DC / DC module DY3 and filtered by the capacitors C3, C4 to obtain a power supply voltage V2.

8. The circuit system according to claim 4, characterized in that: The charging inverter unit includes an AC / DC module, a DC / AC module, a bidirectional DC / DC module and a conversion switch; the AC input provided by the switching mechanism outputs an AC voltage after passing through the AC / DC module, the DC / AC module and the conversion switch; the bidirectional DC / DC module is connected to the charging and discharging ports of the battery, and draws power from the output of the AC / DC module, charges the battery when the battery is undervoltage, and inverts the DC power of the battery into an AC output when the AC input is abnormal.

9. The circuit system according to claim 1, characterized in that: The switching signal unit comprises: A first window comparison circuit is formed by resistors R1, R2, R3 and an operational amplifier A1, and a second window comparison circuit is formed by resistors R4, R5, R6 and an operational amplifier A2; A first voltage divider circuit composed of resistors R7 and R8 connected in series, used to form a reference voltage VCC / 2+VR at a first reference point as a reference voltage input of the first window comparison circuit; A second voltage divider circuit composed of resistors R9 and R10 connected in series, used to form a reference voltage VCC / 2-VR at a second reference point as a reference voltage input of the second window comparison circuit; When the voltage at the third reference point is higher than VCC / 2+VR, the operational amplifier A1 outputs a high level, and when it is lower than VCC / 2+VR, the operational amplifier A1 outputs a low level; when the voltage at the third reference point is higher than VCC / 2-VR, the operational amplifier A2 outputs a low level, and when it is lower than VCC / 2-VR, the operational amplifier A2 outputs a high level; the output signals of the operational amplifier A1 and the operational amplifier A2 are ORed to form the master-slave switching signal.

10. The circuit system according to claim 1, characterized in that: The switching mechanism is realized by an optocoupler GD1, a diode D6, a transistor T1, resistors R11, R12, R13 and a relay Q1. The relay Q1 is a double-pole double-throw relay, whose first contact controls the L end of the AC main power and the AC backup power, and the second contact controls the N end of the AC main power and the AC backup power. When the main-standby switching signal is at a low level, the transistor of the optocoupler GD1 is not turned on, the relay Q1 does not operate, and the AC main power is connected. When the main-standby switching signal is at a high level, the transistor of the optocoupler GD1 is turned on, the relay Q1 operates, and the AC backup power is connected.

11. A battery power supply with AC dual power supply capability, characterized in that: include: Batteries, and A circuit system for realizing dual power supply of battery power supply and AC power supply as claimed in any one of claims 1 to 10.

12. A flameproof and intrinsically safe battery power supply for mining, characterized in that: include: Flameproof battery chambers, flameproof equipment chambers, batteries, and A circuit system for realizing dual power supply of battery power and AC power supply as claimed in any one of claims 1 to 10; Wherein, the battery is placed in the flameproof battery cavity, and the circuit system is placed in the flameproof equipment cavity.

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