A mine explosion-proof and intrinsic safety type DC voltage stabilizing source control circuit

Abstract

The application relates to a mine-used explosion-proof and intrinsic safety type direct-current voltage stabilizing source control circuit, which comprises a charge-discharge control loop connected with a switching power supply and a storage battery, a power supply output control loop connected with the charge-discharge control loop, an output current sampling circuit connected with the charge-discharge control loop, a voltage and temperature acquisition circuit connected with the switching power supply, the storage battery and the charge-discharge control loop, an MCU connected with the output current sampling circuit, the voltage and temperature acquisition circuit and the charge-discharge control loop, an overcurrent control circuit connected with the MCU and the power supply output control loop, a double-isolation protection circuit connected with the charge-discharge control loop and an intrinsic safety CAN communication circuit connected with the MCU. The application controls the charge-discharge process, can control the charge-discharge state of the storage battery, thereby protecting the safety of the storage battery. In addition, the output current of the charge-discharge control loop is detected to control the power supply output control loop, overcurrent control is realized, and the safety of the circuit is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power supply circuit, in particular to a mine explosion-proof and intrinsic safety type DC regulated power supply control circuit. BACKGROUND

[0002] The explosion-proof and intrinsic safety type DC regulated power supply is a special power supply device, which combines the explosion-proof and intrinsic safety. The explosion-proof power supply can withstand internal explosion without damage, and the intrinsic safety power supply has low ignition energy, which can avoid the explosion of the surrounding environment caused by electric spark and overheating in the circuit.

[0003] Due to the particularity of the mine environment, the battery is required to be an intrinsic safety power supply, and it is required not to cause fire and explosion in extreme conditions. The existing battery has the problems of easy fire and explosion under extreme conditions such as overcharge, overdischarge and heating, and lacks control of the charge and discharge state of the battery, so it is difficult to protect the safety of the battery. In addition, some mine explosion-proof and intrinsic safety type DC regulated power supply only uses single-layer isolation control, so that the safety of the power supply is low. SUMMARY

[0004] The present application provides a mine explosion-proof and intrinsic safety type DC regulated power supply control circuit to solve at least one of the above technical problems.

[0005] The technical solution of the present application to solve the above technical problems is as follows: a mine explosion-proof and intrinsic safety type DC regulated power supply control circuit applied to a switching power supply and a battery, comprising:

[0006] A charge and discharge control circuit connected to the switching power supply and the battery, for charging control of the battery under the power supply of the switching power supply, and for discharge control of the switching power supply or the battery;

[0007] A power output control circuit connected to the charge and discharge control circuit, for output control of the discharge signal of the charge and discharge control circuit to output a non-intrinsic safety DC voltage signal;

[0008] An output current sampling circuit connected to the charge and discharge control circuit, for current sampling of the discharge signal of the charge and discharge control circuit to obtain an output current sampling signal;

[0009] A voltage and temperature acquisition circuit connected to the switching power supply, the battery and the charge and discharge control circuit, for acquiring the input voltage and output voltage of the switching power supply, the output voltage and temperature of the battery and the charge and discharge voltage of the charge and discharge control circuit;

[0010] MCU, connected with the output current sampling circuit, the voltage and temperature collection circuit and the charge-discharge control loop, used for processing the output current sampling signal to determine whether the discharge signal of the charge-discharge control loop is overcurrent, and outputting an overcurrent control instruction in the case that the discharge signal of the charge-discharge control loop is overcurrent; and used for controlling the charge-discharge process of the charge-discharge control loop according to one or more of the input voltage and the output voltage of the switching power supply, the output voltage and the temperature of the battery and the charge-discharge voltage of the charge-discharge control loop;

[0011] An overcurrent control circuit is connected with the MCU and the power output control loop, used for controlling the power output control loop to stop outputting the non-intrinsic DC voltage signal according to the overcurrent control instruction;

[0012] A double isolation protection circuit is connected with the charge-discharge control loop, used for isolating and protecting the discharge signal of the charge-discharge control loop to obtain an intrinsic DC voltage signal;

[0013] An intrinsic CAN communication circuit is connected with the MCU, used for isolating the CAN signal of the MCU to obtain an intrinsic CAN signal.

[0014] The application has the advantages that the mine explosion-proof and intrinsic safety type DC voltage stabilizer control circuit can control the charge-discharge process of the charge-discharge control loop according to one or more of the input voltage and the output voltage of the switching power supply, the output voltage and the temperature of the battery and the charge-discharge voltage of the charge-discharge control loop, and can control the charge-discharge state of the battery to protect the battery; the overcurrent control is realized by detecting the output current of the charge-discharge control loop to control whether the power output control loop outputs the non-intrinsic DC voltage signal, and the safety of the circuit is improved; the double isolation protection circuit is used to output the intrinsic DC voltage signal, the isolation degree of the intrinsic safety and the non-intrinsic safety is deepened, and the safety of the power supply is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural block diagram of the mine explosion-proof and intrinsic safety type DC voltage stabilizer control circuit;

[0016] Figure 2 It is a wiring schematic diagram of the mine explosion-proof and intrinsic safety type DC voltage stabilizer control circuit, the switching power supply and the battery;

[0017] Figure 3 It is a wiring schematic diagram of the inside of the control panel;

[0018] Figure 4 It is a circuit principle diagram of the charge-discharge control loop, the power output control loop and the output current sampling circuit.

[0019] Figure 5 The circuit schematic diagram of the overcurrent control circuit;

[0020] Figure 6 The circuit schematic diagram of the voltage and temperature acquisition circuit;

[0021] Figure 7 The circuit schematic diagram of the internal power supply circuit;

[0022] Figure 8 The circuit schematic diagram of the double isolation protection circuit;

[0023] Figure 9 The circuit schematic diagram of the intrinsic safety CAN communication circuit;

[0024] Figure 10 The circuit structure schematic diagram of the battery cell voltage acquisition and output comparison circuit;

[0025] Figure 11 The circuit schematic diagram of Figure 10 a part of the circuit;

[0026] Figure 12 The circuit schematic diagram of Figure 10 another part of the circuit. DETAILED DESCRIPTION

[0027] The principles and features of the present application are described below in conjunction with the accompanying drawings, and the examples are only used to explain the present application and not to limit the scope of the present application.

[0028] As shown in Figure 1 , a mine explosion-proof and intrinsic safety type DC voltage stabilizer control circuit is applied to a switching power supply and a storage battery, and comprises:

[0029] A charge and discharge control loop is connected to the switching power supply and the storage battery, and is used for charge control of the storage battery under the power supply of the switching power supply, and is also used for discharge control of the switching power supply or the storage battery.

[0030] A power output control loop is connected to the charge and discharge control loop, and is used for output control of a discharge signal of the charge and discharge control loop to output a non-intrinsic safety DC voltage signal.

[0031] An output current sampling circuit is connected to the charge and discharge control loop, and is used for current sampling of the discharge signal of the charge and discharge control loop to obtain an output current sampling signal.

[0032] A voltage and temperature acquisition circuit is connected to the switching power supply, the battery and the charge and discharge control circuit, and is configured to acquire the input voltage and output voltage of the switching power supply, the output voltage and temperature of the battery and the charge and discharge voltage of the charge and discharge control circuit.

[0033] An MCU is connected to the output current sampling circuit, the voltage and temperature acquisition circuit and the charge and discharge control circuit, and is configured to process the output current sampling signal to determine whether the discharge signal of the charge and discharge control circuit is overcurrent, and output an overcurrent control instruction in the case that the discharge signal of the charge and discharge control circuit is overcurrent; and is further configured to control the charge and discharge process of the charge and discharge control circuit according to one or more of the input voltage and output voltage of the switching power supply, the output voltage and temperature of the battery and the charge and discharge voltage of the charge and discharge control circuit.

[0034] An overcurrent control circuit is connected to the MCU and the power output control circuit, and is configured to control the power output control circuit to stop outputting the non-intrinsic DC voltage signal according to the overcurrent control instruction.

[0035] A double isolation protection circuit is connected to the charge and discharge control circuit, and is configured to isolate and protect the discharge signal of the charge and discharge control circuit to obtain an intrinsic DC voltage signal.

[0036] An intrinsic CAN communication circuit is connected to the MCU, and is configured to isolate the CAN signal of the MCU to obtain an intrinsic CAN signal.

[0037] In some embodiments, as shown in Figure 1 The application further comprises a battery switch and a master control switch, wherein the battery switch is connected to the charge and discharge control circuit, and the master control switch is connected between the double isolation protection circuit and the charge and discharge control circuit.

[0038] In some embodiments, as shown in Figure 1 The application further comprises an internal power supply circuit, which is connected to the charge and discharge control circuit, and is configured to perform voltage conversion processing on the discharge signal of the charge and discharge control circuit to obtain an internal voltage signal.

[0039] Specifically, the internal power supply circuit is connected to the charge and discharge control circuit through the master control switch. The internal voltage signal includes an internal 5V voltage signal O_V_5V and an internal 3.3V voltage signal O_V_3.3V, which are used to provide working power supply for the charge and discharge control circuit, the output current sampling circuit, the voltage and temperature acquisition circuit, the overcurrent control circuit, the MCU and the intrinsic CAN communication circuit.

[0040] Figure 2This is a wiring diagram of a mine-use flameproof and intrinsically safe DC voltage-stabilized source control circuit, a switching power supply, and a battery according to the present invention;

[0041] Among them, the charge and discharge control circuit, power output control circuit, output current sampling circuit, voltage and temperature acquisition circuit, MCU, overcurrent control circuit, double isolation protection circuit and intrinsically safe CAN communication circuit are integrated on the PCB board to form a control board; the switching power supply is specifically the SD350B switching power supply; the battery is specifically a 24V / 20Ah nickel-metal hydride battery pack.

[0042] Figure 3 for Figure 2 The wiring diagram inside the control panel includes non-intrinsically safe signals and intrinsically safe signals.

[0043] Non-intrinsically safe signals are as follows:

[0044] 1) The power supply is connected to the 24V DC voltage output by the locomotive generator regulator through the "24V power input terminal";

[0045] 2) The 24V DC voltage is connected to the SD350B switching power supply through the "SD350B input" terminal, and is converted into DC28V after being stabilized by the SD350B. This DC28V is connected to the control board through the "SD350B output" terminal;

[0046] 3) The "main switch" is used to control the internal power supply of the control board and the "power supply of the battery cell voltage monitoring module". When it is turned on, the control board and the battery cell voltage monitoring circuit are powered on;

[0047] 4) The output voltage of the 24V / 20Ah NiMH battery pack is connected to the control board through the "battery pack voltage output" port;

[0048] 5) The temperature and cell overvoltage detection signals of the 24V / 20Ah NiMH battery pack are connected to the control board through the "battery pack overvoltage signal and temperature signal output";

[0049] 6) The “battery pack power off switch” is a mechanical switch that cuts off the battery pack power output when disconnected, preventing the electrical system from consuming battery power when stored for a long time and preventing the battery pack output from being cut off during underground maintenance.

[0050] The intrinsically safe signals are as follows:

[0051] 1) 1 intrinsically safe CAN communication output;

[0052] 2) 1 intrinsically safe 12V power output;

[0053] 3) 1 intrinsically safe power indicator light output.

[0054] In some embodiments, as Figure 4 As shown, the charge and discharge control circuit includes:

[0055] a capacitor C5, one end of which is connected to one end K- of the battery switch, and the other end of which is connected to the other end K+ of the battery switch;

[0056] a Hall element U3, the VCC pin of which is connected to the internal voltage signal, the I N pin of which is connected to the positive pole of the battery, the OUT pin of which is connected to the other end of the capacitor C5, and the Vout pin of which is connected to the MCU;

[0057] a diode D46, the positive pole of which is connected to one end K- of the battery switch;

[0058] a resistor R4, one end of which is connected to the negative pole of the diode D46, and the other end of which is connected to the power supply output control loop and the output current sampling circuit;

[0059] a diode D47, which is connected in parallel with the diode D46 at the same pole;

[0060] a diode D49, the positive pole of which is connected to the output positive pole VI+ of the switching power supply, and the negative pole of which is connected to the negative pole of the diode D46;

[0061] a diode D48, which is connected in parallel with the diode D49 at the same pole;

[0062] a voltage stabilizing tube D14, the positive pole of which is connected to the output negative pole VI- of the switching power supply, and the negative pole of which is connected to the negative pole of the diode D49;

[0063] a MOS tube Q1, the drain of which is connected to one end K- of the battery switch;

[0064] a resistor R7, one end of which is connected to the source of the MOS tube Q1;

[0065] a diode D9, the negative pole of which is connected to the other end of the resistor R7, and the positive pole of which is connected to the positive pole of the diode D49;

[0066] a resistor R8, which is connected in parallel with the resistor R7;

[0067] a triode Q2, the base of which is connected to the source of the MOS tube Q1, and the collector of which is connected to the gate of the MOS tube Q1;

[0068] a resistor R10, one end of which is connected to the collector of the triode Q2, and the other end of which is connected to the emitter of the triode Q2 and the other end of the resistor R7;

[0069] a resistor R11, one end of which is connected to one end of the resistor R10, and the other end of which is connected to the ground;

[0070] an optical coupler U4, the light receiving end emitter of which is connected to one end of the resistor R10, and the light receiving end collector of which is connected to the other end of the resistor R10;

[0071] Resistor R9, one end connected to the light emitting end positive pole of the optocoupler U4, the other end connected to the internal voltage signal;

[0072] Schnitter trigger U1 D, input end connected to the MCU, output end connected to the light emitting end negative pole of the optocoupler U4, power supply end connected to one end of the resistor R9, ground end connected to the other end of the resistor R11.

[0073] Specifically, when the SD350B switching power supply is not outputting (the external generator regulator is not working) and the battery switch is on, the battery is discharged through the Hall element U3 and the diode D46 / D47, the Hall element U3 detects the discharge current size, and the diode D48 / D49 / D9 is a reverse prevention diode to prevent current from flowing to the output end of the SD350B switching power supply. When the SD350B switching power supply has output (the external generator regulator is not working) and the battery switch is on, the SD350B switching power supply is discharged through the diode D48 / D49, and the diode D46 / D47 is a reverse prevention diode to prevent current from flowing to the battery pack. At the same time, the battery pack is charged through the Hall element U3, the MOS tube Q1, the resistor R7 / R8 and the diode D9, the Hall element U3 detects the charging current size, and the MOS tube Q1, the triode Q2, the resistor R7 / R8 / R10 / R11 control the charging current size. At the same time, under the fault condition, the MCU can open the optocoupler U4 through the control I_S_OPT to turn off the battery pack charging circuit. The voltage stabilizing tube D14 is a surge protection device.

[0074] In some embodiments, as shown in Figure 4 The power output control circuit includes:

[0075] Relay LS1, one contact connected to the other end of the resistor R4, the other contact being the output end of the power output control circuit and used for outputting the non-intrinsic DC voltage signal, and the coil one end connected to the other end of the resistor R4;

[0076] Diode D1, negative pole connected to the other contact of the relay LS1, positive pole grounded;

[0077] Diode D2, positive pole connected to the other end of the coil of the relay LS1 and the overcurrent control circuit, negative pole connected to the one end of the coil of the relay LS1;

[0078] Diode D4, same polarity as the diode D2 and in parallel;

[0079] Resistor R1, one end connected to one contact of the relay LS1;

[0080] Capacitor C1, one end connected to the other end of the resistor R1, the other end connected to the other contact of the relay LS1;

[0081] a resistor R2, connected in parallel with the resistor R1.

[0082] In particular, the diodes D1 / D2 / D4 are freewheeling diodes, the resistors R1 / R2 and the capacitor C1 form a spike absorption circuit for protecting the contacts of the relay LS1.

[0083] In some embodiments, as shown in FIG. 1, the output current sampling circuit comprises: Figure 4

[0084] a resistor R6, one end of which is connected to one end of the resistor R4;

[0085] a resistor R3, one end of which is connected to the other end of the resistor R4;

[0086] a capacitor C2, one end of which is connected to the other end of the resistor R6 and the other end of which is connected to the other end of the resistor R3;

[0087] a comparator U2, the positive input end of which is connected to the other end of the resistor R6, the negative input end of which is connected to the other end of the resistor R3, the power supply end of which is connected to an internal voltage signal and grounded through a capacitor C3, and the ground end of which is grounded;

[0088] a resistor R5, one end of which is connected to the output end of the comparator U2 and the other end of which outputs the output current sampling signal;

[0089] a capacitor C4, one end of which is connected to the other end of the resistor R5 and the other end of which is grounded;

[0090] a diode pair D3, in which two diodes are connected in forward direction, the positive electrode of which is connected to the other end of the capacitor C4 and the negative electrode of which is connected to an internal voltage signal.

[0091] In particular, the resistor R4 is a sampling resistor. O_V_OUT.CUR is connected to an analog input port of an MCU, and the maximum output current of a power supply is collected.

[0092] In some embodiments, as shown in FIG. 2, the overcurrent control circuit comprises: Figure 5

[0093] a Schmitt trigger U1A, the input end of which is connected to the MCU to access the overcurrent control instruction, the power supply end of which is connected to an internal voltage signal, and the ground end of which is grounded;

[0094] a Schmitt trigger U1 B, the input end of which is connected to the output end of the Schmitt trigger U1A, the power supply end of which is connected to an internal voltage signal, and the ground end of which is grounded;

[0095] a Schmitt trigger U1 C, the input end of which is connected to the output end of the Schmitt trigger U1A, the power supply end of which is connected to an internal voltage signal, the ground end of which is grounded, and the output end of which is connected to the output end of the Schmitt trigger U1 B; ​​

[0096] A capacitor C69, one end of which is connected to the power supply terminal of the Schmitt trigger U1A, Schmitt trigger U1B, and Schmitt trigger U1C, respectively, and the other end of which is grounded;

[0097] A resistor R16, one end of which is connected to the output terminal of the Schmitt trigger U1 B, and the other end of which is grounded;

[0098] A resistor R15, one end of which is connected to the output end of the Schmitt trigger U1 B;

[0099] MOS transistor Q3, the gate of which is connected to the other end of the resistor R15, and the source of which is grounded;

[0100] The diode D45 has a cathode connected to the drain of the MOS transistor Q3 and an anode connected to the anode of the diode D2.

[0101] When the current value collected by the output current sampling circuit is greater than the set value, the MCU outputs an overcurrent control instruction (I_S_RELAY) to the overcurrent control circuit to control relay LS1 to close and cut off the power output.

[0102] In some embodiments, the circuit schematic diagram of the voltage and temperature acquisition circuit is as follows: Figure 6 As shown, it is used to respectively collect the power supply output voltage (regulator output voltage), SD350B switching power supply input voltage, SD350B switching power supply output voltage, Hall sensor U3 output voltage (i.e., battery pack charge and discharge current), power supply output voltage and battery temperature. The output ends of the above collection channels are all connected to the MCU.

[0103] In some embodiments, the circuit schematic diagram of the internal power supply circuit is as follows: Figure 7 As shown, a 5V internal voltage signal O_V_5V and a 3.3V internal voltage signal O_V_3.3V are output respectively; the fuse and the voltage regulator tube constitute an output voltage protection circuit.

[0104] In some embodiments, as Figure 8 As shown, one end KO- of the main control switch is connected to one end of the resistor R4,

[0105] Double isolation protection circuit includes:

[0106] A capacitor C49, one end of which is connected to the other end KO+ of the main control switch, and the other end of which is grounded;

[0107] Resistor C13 is connected in parallel with the capacitor C49;

[0108] Resistor C14, connected in parallel with the capacitor C13;

[0109] The isolation voltage conversion chip U12, the Vin1+ pin and the Vin2+ pin are connected to one end of the capacitor C49, and the Vin1- pin and the Vin2- pin are connected to the other end of the capacitor C49;

[0110] The resistor R50, one end of which is connected to the Vout1+ pin and the Vout2+ pin of the voltage conversion chip U12, and the other end of which is connected to the Trim1 pin and the Trim2 pin of the voltage conversion chip U12;

[0111] The resistor R54, one end of which is connected to the Trim1 pin and the Trim2 pin of the voltage conversion chip U12, and the other end of which is connected to the Vout1- pin and the Vout2- pin of the voltage conversion chip U12 and is connected to the intrinsic safety ground;

[0112] The capacitor C52, one end of which is connected to the Vout1+ pin of the voltage conversion chip U12, and the other end of which is connected to the intrinsic safety ground;

[0113] The capacitor C53, the capacitor C54, the capacitor C55, the capacitor C56 and the capacitor C57 are all connected in parallel with the capacitor C52;

[0114] The resistor R65 is connected in parallel with the capacitor C52;

[0115] The first overvoltage and overcurrent protection circuit is connected to both ends of the resistor R65;

[0116] The second overvoltage and overcurrent protection circuit is connected to the first overvoltage and overcurrent protection circuit and outputs the intrinsic safety DC voltage signal;

[0117] The resistor R59 and the capacitor C58 are connected in series and then connected to the second overvoltage and overcurrent protection circuit;

[0118] The diode D37 is connected in parallel with the resistor R59;

[0119] The resistor R60 and the light-emitting diode D39 are connected in series and then connected in parallel with the circuit formed by the resistor R59 and the capacitor C58 connected in series;

[0120] The diode D38 is connected in parallel with the circuit formed by the resistor R60 and the light-emitting diode D39 connected in series.

[0121] The first overvoltage and overcurrent protection circuit has the same structure as the second overvoltage and overcurrent protection circuit, and the first overvoltage and overcurrent protection circuit comprises:

[0122] a resistor R63, a resistor R66 and a resistor R70 are connected in series and then connected at two ends of the resistor R65;

[0123] a diode D32, a resistor R57 and a capacitor C50 are connected in series and then connected at two ends of the resistor R65;

[0124] an over-voltage and over-current protection chip U13, an OV pin is connected to one end of the resistor R66, a UV pin is connected to the other end of the resistor R66, a TMR pin is connected to an intrinsically safe ground through a capacitor C59, and a FB pin is connected to an intrinsically safe ground through a capacitor C60, a pin and a VCC pin are connected between the resistor R57 and the capacitor C50, and a GATE pin is connected to an intrinsically safe ground through a resistor R52 and a capacitor C47 in series;

[0125] a diode D34 is connected in parallel with the resistor R52;

[0126] a MOS transistor Q4, a gate is connected to the GATE pin of the over-voltage and over-current protection chip U13 through a resistor R53, a drain is connected to a positive pole of the diode D32, and a source is connected to an SNS pin of the over-voltage and over-current protection chip U13;

[0127] a resistor R48, one end is connected to the source of the MOS transistor Q4;

[0128] a resistor R61, one end is connected to the other end of the resistor R48 and an OUT pin of the over-voltage and over-current protection chip U13;

[0129] a resistor R67, one end is connected to the other end of the resistor R61 and a FB pin of the over-voltage and over-current protection chip U13, and the other end is connected to an intrinsically safe ground.

[0130] Specifically, 24V input is converted into 12V power supply through an isolation voltage conversion chip U12, over-voltage and over-current protection is realized through a first over-voltage and over-current protection circuit and a second over-voltage and over-current protection circuit, and two levels are adopted to realize double over-voltage and over-current protection to meet the intrinsically safe requirement.

[0131] In some embodiments, as shown in Figure 9 the intrinsically safe CAN communication circuit comprises:

[0132] a Schmitt trigger U1E, an output end is connected to the MCU through a resistor R42 and then connected to the ground through the resistor R42 and a capacitor C40 in series, a power supply end is connected to an internal voltage signal, and a ground end is connected to the ground;

[0133] a voltage stabilizing tube D27, connected to the power supply end and the ground end of the Schmitt trigger U1E;

[0134] resistor R41, connecting the input terminal of the Schmitt trigger U1E and the power terminal;

[0135] capacitor C39, connecting the power terminal of the Schmitt trigger U1E and the ground terminal;

[0136] optocoupler U8, the light-receiving end emitter connecting the ground terminal of the Schmitt trigger U1E, the light-receiving end collector connecting the input terminal of the Schmitt trigger U1E, and the light-receiving end base connecting the power terminal of the Schmitt trigger U1E;

[0137] resistor R40, one end connecting the light-emitting end anode of the optocoupler U8;

[0138] voltage stabilizing tube D28, the negative pole connecting the other end of the resistor R40, and the positive pole connecting the light-emitting end cathode of the optocoupler U8;

[0139] Schmitt trigger U9A, the output terminal connecting the positive pole of the voltage stabilizing tube D28, the ground terminal being connected to the intrinsically safe ground, and the power terminal connecting the intrinsically safe DC voltage and the negative pole of the voltage stabilizing tube D28 through the resistor R39; Schmitt trigger U1F, the input terminal connecting the MCU through the resistor R47 and being grounded through the capacitor C41, the ground terminal being grounded, and the power terminal being connected to the internal voltage signal;

[0140] voltage stabilizing tube D29, the positive pole connecting the output terminal of the Schmitt trigger U1F, and the negative pole connecting the power terminal of the Schmitt trigger U1F;

[0141] resistor R46, one end connecting the negative pole of the voltage stabilizing tube D29;

[0142] optocoupler U11, the light-emitting end anode connecting the other end of the resistor R46, and the light-emitting end cathode connecting the output terminal of the Schmitt trigger U1F;

[0143] capacitor C42, one end connecting the light-receiving end emitter of the optocoupler U11, and the other end connecting the light-receiving end base of the optocoupler U11;

[0144] resistor R45, connecting the light-receiving end collector and the light-receiving end base of the optocoupler U11;

[0145] voltage stabilizing tube D3, the positive pole connecting the light-receiving end emitter of the optocoupler U11, and the negative pole connecting the light-receiving end base of the optocoupler U11;

[0146] Schmitt trigger U9C, the input terminal connecting the light-receiving end collector of the optocoupler U11, the ground terminal being connected to the intrinsically safe ground, and the power terminal connecting the intrinsically safe DC voltage and the light-receiving end base of the optocoupler U11;

[0147] CAN chip, RX pin is connected with the input end of the Schmitt trigger U9A, VCC pin is connected with the safety DC voltage and is connected with the safety ground through the capacitor C46, GND pin is connected with the safety ground, TX pin is connected with the output end of the Schmitt trigger U9C, Vio pin is the safety DC voltage, S pin is connected with the safety ground;

[0148] Common mode inductor L5, one end of one coil is connected with the CANL pin of the CAN chip, one end of the other coil is connected with the CANH pin of the CAN chip, the other end of one coil is connected with the CAN_L signal in the safety CAN signal, and the other end of the other coil outputs the CAN_H signal in the safety CAN signal

[0149] One of the two switches SW1 is connected with the other end of one coil of the common mode inductor L5 through the resistor R43, one static end is suspended, and the other static end is connected with the other end of the other coil of the common mode inductor L5 through the resistor R44;

[0150] Capacitor C45, one end is connected with the other static end of the one of the two switches SW1, and the other end is connected with the safety ground;

[0151] Transient suppression diode D31, one pair of anodes is connected with the other end of the two coils of the common mode inductor L5, and the other pair of anodes is connected with the safety ground;

[0152] Capacitor C44, one end is connected with the other end of one coil of the common mode inductor L5, and the other end is connected with the safety ground;

[0153] Capacitor C43, one end is connected with the other end of the other coil of the common mode inductor L5, and the other end is connected with the safety ground.

[0154] Specifically, the optical coupler U8 / U11 is a safety and non-safety isolation device, which meets the safety and non-safety isolation voltage requirements; the fuse F5, the resistor R39 and the voltage stabilizing tube D28 are the optical coupler input end protection circuit; the O_F_CAN.RX signal and the I_F_CAN.TX signal are CAN signals, which are connected to the MCU.

[0155] In some embodiments, the MCU adopts the core chip of STM32L431RCT6 model.

[0156] In some embodiments, the mine explosion-proof and safety type DC voltage stabilizing source control circuit further comprises a collection board, and the collection board is arranged in the storage battery. Figure 10As shown in the figure; wherein, the circuit module 01 is the acquisition board power supply circuit; O_S_COMP is the output comparison circuit output signal (the Tr signal of the control board), when the cell voltage is not over limit, the signal is high level, if the acquisition voltage is greater than the reference voltage, the single cell overvoltage, O_S_COMP is low level, and O_S_ST end outputs the overvoltage state signal to MCU.

[0157] Figure 10 The specific circuit principle of the circuit module 02 in the figure is shown in the figure Figure 11 The single cell voltage is collected by operational amplifier U15 / U16, compared with the reference voltage I_V_REF, and when the single cell voltage exceeds the reference voltage, the o_s_comp end outputs low level.

[0158] Figure 10 The specific circuit principle of the circuit module 01 in the figure is shown in the figure Figure 12 Only when the main control switch on the control board is turned on, the power supply positive and ground wire of the acquisition board is connected, and this design can ensure that the acquisition board realizes zero power consumption in the case of system power failure, prolonging the service life of the battery pack in the power supply. The power supply chip U12 provides internal power supply for the acquisition board. Chip U13 provides reference voltage O_V_Vref. The mine explosion-proof and intrinsic safety type DC voltage stabilizing source control circuit according to the present application can control the charging and discharging process of the charging and discharging control loop according to one or more of the input voltage and output voltage of the switching power supply, the output voltage and temperature of the battery and the charging and discharging voltage of the charging and discharging control loop, and can control the charging and discharging state of the battery, thereby protecting the safety of the battery; moreover, the present application detects the output current of the charging and discharging control loop to control whether the power supply output control loop outputs a non-intrinsic safety DC voltage signal, realizes overcurrent control, and improves the safety of the circuit; in addition, the present application uses a double isolation protection circuit to output an intrinsic safety DC voltage signal, which deepens the isolation degree of intrinsic safety and non-intrinsic safety, thereby improving the safety of the power supply.

[0159] The above only describes the preferred embodiments of the present application, and does not limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A mine-used explosion-proof and intrinsically safe DC voltage stabilizer control circuit, characterized in that, The application is applied to switching power supply and battery, comprising: a charge-discharge control circuit connected with the switching power supply and the battery, used for charge control of the battery under the power supply of the switching power supply, and discharge control of the switching power supply or the battery; a power output control circuit connected with the charge-discharge control circuit, used for output control of the discharge signal of the charge-discharge control circuit to output a non-intrinsic DC voltage signal; an output current sampling circuit connected with the charge-discharge control circuit, used for current sampling of the discharge signal of the charge-discharge control circuit to obtain an output current sampling signal; a voltage and temperature acquisition circuit connected with the switching power supply, the battery and the charge-discharge control circuit, used for acquisition of the input voltage and output voltage of the switching power supply, the output voltage and temperature of the battery and the charge-discharge voltage of the charge-discharge control circuit; an MCU connected with the output current sampling circuit, the voltage and temperature acquisition circuit and the charge-discharge control circuit, used for processing of the output current sampling signal to determine whether the discharge signal of the charge-discharge control circuit is overcurrent, and outputting an overcurrent control instruction in the case that the discharge signal of the charge-discharge control circuit is overcurrent; and used for controlling the charge-discharge process of the charge-discharge control circuit according to one or more of the input voltage and output voltage of the switching power supply, the output voltage and temperature of the battery and the charge-discharge voltage of the charge-discharge control circuit; an overcurrent control circuit connected with the MCU and the power output control circuit, used for controlling the power output control circuit to stop outputting the non-intrinsic DC voltage signal according to the overcurrent control instruction; a double isolation protection circuit connected with the charge-discharge control circuit, used for isolation and protection of the discharge signal of the charge-discharge control circuit to obtain an intrinsic DC voltage signal; an intrinsic CAN communication circuit connected with the MCU, used for isolation of the CAN signal of the MCU to obtain an intrinsic CAN signal; the intrinsic CAN communication circuit comprises: a Schmitt trigger U9A, an output end of which is connected with the anode of a stabilizing tube D28, a grounding end of which is connected with an intrinsic ground, and a power supply end of which is connected with an intrinsic DC voltage and the cathode of the stabilizing tube D28 through a resistor R39; a Schmitt trigger U1F, an input end of which is connected with the MCU through a resistor R47 and grounded through a capacitor C41, a grounding end of which is grounded, and a power supply end of which is connected with an internal voltage signal; a Schmitt trigger U9C, an input end of which is connected with the light-receiving end collector of a photo-coupler U11, a grounding end of which is connected with an intrinsic ground, and a power supply end of which is connected with an intrinsic DC voltage and the light-receiving end base of the photo-coupler U11.

2. The mine explosion-proof and intrinsically safe DC voltage stabilizing source control circuit according to claim 1, characterized in that, a battery switch connected with the charge-discharge control circuit; a master control switch connected between the double isolation protection circuit and the charge-discharge control circuit.

3. The mine explosion-proof and intrinsically safe DC voltage stabilizing source control circuit according to claim 1, characterized in that, an internal power supply circuit connected with the charge-discharge control circuit, used for voltage transformation processing of the discharge signal of the charge-discharge control circuit to obtain an internal voltage signal.

4. The mine explosion-proof and intrinsically safe DC voltage stabilizing source control circuit according to claim 2, characterized in that, the charge-discharge control circuit comprises: Capacitor C5, one end connected to one end K- of the battery switch, the other end connected to the other end K+ of the battery switch; Hall element U3, VCC pin connected to internal voltage signal, IN pin connected to the positive pole of the battery, OUT pin connected to the other end of the capacitor C5, Vout pin connected to the MCU; Diode D46, positive pole connected to one end K- of the battery switch; Resistor R4, one end connected to the negative pole of the diode D46, the other end connected to the power output control circuit and the output current sampling circuit; Diode D47, connected to the same pole of the diode D46 in parallel; Diode D49, positive pole connected to the output positive pole VI+ of the switching power supply, negative pole connected to the negative pole of the diode D46; Diode D48, connected to the same pole of the diode D49 in parallel; Zener diode D14, positive pole connected to the output negative pole VI- of the switching power supply, negative pole connected to the negative pole of the diode D49; MOS tube Q1, drain connected to one end K- of the battery switch; Resistor R7, one end connected to the source of the MOS tube Q1; Diode D9, negative pole connected to the other end of the resistor R7, positive pole connected to the positive pole of the diode D49; Resistor R8, connected to the resistor R7 in parallel; Triode Q2, base connected to the source of the MOS tube Q1, collector connected to the gate of the MOS tube Q1; Resistor R10, one end connected to the collector of the triode Q2, the other end connected to the emitter of the triode Q2 and the other end of the resistor R7; Resistor R11, one end connected to one end of the resistor R10, the other end connected to ground; Optocoupler U4, light receiving end emitter connected to one end of the resistor R10, light receiving end collector connected to the other end of the resistor R10; Resistor R9, one end connected to the light emitting end positive pole of the optocoupler U4, the other end connected to internal voltage signal; Schnitt trigger U1D, input end connected to the MCU, output end connected to the light emitting end negative pole of the optocoupler U4, power supply end connected to one end of the resistor R9, ground end connected to the other end of the resistor R11.

5. The mine explosion-proof and intrinsically safe DC voltage stabilizing source control circuit according to claim 4, characterized in that, The power output control circuit comprises: Relay LS1, one contact connected to the other end of the resistor R4, the other contact is the output end of the power output control circuit and is used for outputting the non-intrinsic direct current voltage signal, one end of the coil connected to the other end of the resistor R4; Diode D1, negative pole connected to the other contact of the relay LS1, positive pole connected to ground; Diode D2, positive pole connected to the other end of the coil of the relay LS1 and the overcurrent control circuit, negative pole connected to one end of the coil of the relay LS1; Diode D4, connected to the same pole of the diode D2 in parallel; Resistor R1, one end connected to one contact of the relay LS1; Capacitor C1, one end connected to the other end of the resistor R1, the other end connected to the other contact of the relay LS1; Resistor R2, connected to the resistor R1 in parallel.

6. The mine explosion-proof and intrinsically safe DC regulated power supply control circuit according to claim 4, characterized in that, The output current sampling circuit comprises: Resistor R6, one end connected to one end of the resistor R4; Resistor R3, one end connected to the other end of the resistor R4; Capacitor C2, one end connected to the other end of the resistor R6, the other end connected to the other end of the resistor R3; Comparator U2, the positive input end connected to the other end of the resistor R6, the negative input end connected to the other end of the resistor R3, the power supply end connected to the internal voltage signal and grounded through capacitor C3, the ground end grounded; Resistor R5, one end connected to the output end of the comparator U2, the other end outputting the output current sampling signal; Capacitor C4, one end connected to the other end of the resistor R5, the other end grounded; Two diodes in series diode pair D3, the positive electrode connected to the other end of the capacitor C4, the negative electrode connected to the internal voltage signal.

7. The mine explosion-proof and intrinsically safe DC regulated power supply control circuit according to claim 5, characterized in that, The overcurrent control circuit comprises: Schmitt trigger U1A, the input end connected to the MCU to access the overcurrent control instruction, the power supply end connected to the internal voltage signal, the ground end grounded; Schmitt trigger U1B, the input end connected to the output end of the Schmitt trigger U1A, the power supply end connected to the internal voltage signal, the ground end grounded; Schmitt trigger U1C, the input end connected to the output end of the Schmitt trigger U1A, the power supply end connected to the internal voltage signal, the ground end grounded, and the output end connected to the output end of the Schmitt trigger U1B; Capacitor C69, one end connected to the power supply end of the Schmitt trigger U1A, the Schmitt trigger U1B and the Schmitt trigger U1C respectively, the other end grounded; Resistor R16, one end connected to the output end of the Schmitt trigger U1B, the other end grounded; Resistor R15, one end connected to the output end of the Schmitt trigger U1B; MOS tube Q3, the gate connected to the other end of the resistor R15, the source grounded; Diode D45, the negative electrode connected to the drain of the MOS tube Q3, the positive electrode connected to the positive electrode of the diode D2.

8. The mine explosion-proof and intrinsically safe DC regulated power supply control circuit according to claim 4, characterized in that, One end KO- of the main control switch connected to one end of the resistor R4, The double isolation protection circuit comprises: Capacitor C49, one end connected to the other end KO+ of the main control switch, the other end grounded; Resistor capacitor C13, connected in parallel with the capacitor C49; Resistor capacitor C14, connected in parallel with the capacitor C13; Isolation voltage conversion chip U12, Vin1+ pin and Vin2+ pin connected to one end of the capacitor C49, Vin1- pin and Vin2- pin connected to the other end of the capacitor C49; Resistor R50, one end connected to Vout1+ pin and Vout2+ pin of the voltage conversion chip U12, the other end connected to Trim1 pin and Trim2 pin of the voltage conversion chip U12; Resistor R54, one end connected to Trim1 pin and Trim2 pin of the voltage conversion chip U12, the other end connected to Vout1- pin and Vout2- pin of the voltage conversion chip U12 and connected to the intrinsically safe ground; Capacitor C52, one end connected to Vout1+ pin of the voltage conversion chip U12, the other end connected to the intrinsically safe ground; Capacitor C53, capacitor C54, capacitor C55, capacitor C56 and capacitor C57, all connected in parallel with the capacitor C52 respectively; Resistor R65, connected in parallel with the capacitor C52; A first overvoltage and overcurrent protection circuit is connected between two ends of the resistor R65. A second overvoltage and overcurrent protection circuit is connected to the first overvoltage and overcurrent protection circuit and outputs the intrinsically safe DC voltage signal. The resistor R59 and the capacitor C58 are connected in series and then connected to the second overvoltage and overcurrent protection circuit. The diode D37 is connected in parallel with the resistor R59. The resistor R60 and the light emitting diode D39 are connected in series and then connected in parallel with the circuit formed by the resistor R59 and the capacitor C58. The diode D38 is connected in parallel with the circuit formed by the resistor R60 and the light emitting diode D39.

9. The mine explosion-proof and intrinsically safe DC regulated power supply control circuit according to claim 8, characterized in that, The first overvoltage and overcurrent protection circuit has the same structure as the second overvoltage and overcurrent protection circuit. The first overvoltage and overcurrent protection circuit comprises: The resistor R63, the resistor R66 and the resistor R70 are connected in series and then connected between two ends of the resistor R65. The diode D32, the resistor R57 and the capacitor C50 are connected in series and then connected between two ends of the resistor R65. The overvoltage and overcurrent protection chip U13 has one end of the resistor R66 connected to the OV pin, the other end of the resistor R66 connected to the UV pin, and the TMR pin connected to the intrinsically safe ground through the capacitor C59, and the FB pin connected to the intrinsically safe ground through the capacitor C60. The pin and the VCC pin are connected between the resistor R57 and the capacitor C50, and the GATE pin is connected to the intrinsically safe ground through the resistor R52 and the capacitor C47 connected in series. The diode D34 is connected in parallel with the resistor R52. The MOS transistor Q4 has its gate connected to the GATE pin of the overvoltage and overcurrent protection chip U13 through the resistor R53, its drain connected to the anode of the diode D32, and its source connected to the SNS pin of the overvoltage and overcurrent protection chip U13. The resistor R48 has one end connected to the source of the MOS transistor Q4. The resistor R61 has one end connected to the other end of the resistor R48 and the OUT pin of the overvoltage and overcurrent protection chip U13. The resistor R67 has one end connected to the other end of the resistor R61 and the FB pin of the overvoltage and overcurrent protection chip U13, and the other end connected to the intrinsically safe ground.

10. The mine explosion-proof and intrinsically safe DC regulated power supply control circuit according to claim 1, characterized in that, The intrinsically safe CAN communication circuit further comprises: The Schmitt trigger U1E has its output connected to the MCU through the resistor R42, and then connected to the ground through the resistor R42 and the capacitor C40, has its power supply connected to the internal voltage signal, and has its ground connected to the ground. The voltage stabilizing tube D27 is connected to the power supply and the ground of the Schmitt trigger U1E. The resistor R41 is connected to the input and the power supply of the Schmitt trigger U1E. The capacitor C39 is connected to the power supply and the ground of the Schmitt trigger U1E. The light coupling U8 has its light receiving end emitter connected to the ground of the Schmitt trigger U1E, its light receiving end collector connected to the input of the Schmitt trigger U1E, and its light receiving end base connected to the power supply of the Schmitt trigger U1E. The resistor R40 has one end connected to the anode of the light emitting end of the light coupling U8. The voltage stabilizing tube D28 has its cathode connected to the other end of the resistor R40, and its anode connected to the cathode of the light emitting end of the light coupling U8. The voltage stabilizing tube D29 has its anode connected to the output of the Schmitt trigger U1F, and its cathode connected to the power supply of the Schmitt trigger U1F. The resistor R46 has one end connected to the cathode of the voltage stabilizing tube D29. The light coupling U11, the light emitting end positive pole connects the other end of the resistance R46, the light emitting end negative pole connects the output end of the Schmitt trigger U1F; The capacitor C42, one end connects the light receiving end emitter of the light coupling U11, the other end connects the light receiving end base of the light coupling U11; The resistance R45, connects the light receiving end collector and the light receiving end base of the light coupling U11; The voltage stabilizing tube D3, the positive pole connects the light receiving end emitter of the light coupling U11, the negative pole connects the light receiving end base of the light coupling U11; The CAN chip, the RX pin connects the input end of the Schmitt trigger U9A, the VCC pin connects the safety DC voltage and the safety ground through the capacitor C46, the GND pin connects the safety ground, the TX pin connects the output end of the Schmitt trigger U9C, the Vio pin safety DC voltage, the S pin connects the safety ground; The common mode inductor L5, one end of a coil connects the CANL pin of the CAN chip, the other end of a coil connects the CANH pin of the CAN chip, the other end of a coil inputs the CAN_L signal in the safety CAN signal, the other end of the other coil outputs the CAN_H signal in the safety CAN signal; The two alternative switches SW1, the moving end connects the other end of a coil of the common mode inductor L5 through the resistance R43, one static end is suspended, the other static end connects the other end of the other coil of the common mode inductor L5 through the resistance R44; The capacitor C45, one end connects the other static end of the two alternative switches SW1, the other end connects the safety ground; The transient suppression diode D31, one pair of positive poles respectively connects the other end of the two coils of the common mode inductor L5, the other pair of positive poles connects the safety ground; The capacitor C44, one end connects the other end of a coil of the common mode inductor L5, the other end connects the safety ground; The capacitor C43, one end connects the other end of the other coil of the common mode inductor L5, the other end connects the safety ground.

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