CN203734530U - Classified start-up mine intrinsically safe power supply - Google Patents

Abstract

The utility model provides a mining ann's power of hierarchical start-up formula, including at least DC power supply unit, guard grating circuit, storage battery, power supply control circuit, the battery power supply control circuit that receive the direct current and carry out step-up or step-down with the direct current and handle, be used for obtaining storage battery's voltage and carry out the voltage comparison unit and the control unit of comparison operation with the reference voltage that sets up; the DC/DC power supply unit is electrically connected with the safety barrier circuit through a power supply control circuit; the storage battery pack is electrically connected with the safety barrier circuit through a storage battery power supply control circuit; the input end of the voltage comparison unit is electrically connected with the storage battery pack, the output end of the voltage comparison unit is electrically connected with the DC/DC power supply unit, the control unit is powered by the DC/DC power supply unit and outputs control signals to the power supply control circuit and the storage battery supply control circuit, and the control unit is also electrically connected with the anode of the storage battery pack; the utility model discloses adopt undercurrent crescent operating current until stable mode when starting, realize the start-up of different current levels, the false triggering of this ampere of power that the heavy current when can avoiding this ampere of circuit to start caused to the area load ability of reinforcing input this ampere of power.

Description

Classified start-up mine intrinsically safe power supply

technical field

The utility model relates to an intrinsically safe power supply, in particular to a graded start-up mine intrinsically safe power supply. the

Background technique

Intrinsically safe power supply is intrinsically safe power supply. This kind of power supply has intrinsically safe performance in the highest output voltage and maximum current under normal operation and fault conditions. Intrinsically safe power supplies are widely used in mines. The standby time of current mine intrinsically safe power supplies is not less than 2 hours. However, with the popularization and application of underground emergency avoidance systems in mines, the intrinsically safe The standby time of the power supply is not less than 96 hours, but the standby time of the intrinsically safe power supply in the prior art is far from reaching the 96-hour standby requirement, which is not conducive to the stable operation of the emergency avoidance system in the mine, and is likely to cause safety hazards; and, now The intrinsically safe power supply in the prior art often adopts a direct start-up method when starting, and the instantaneous current at startup is large, which has a large impact on the internal circuit of the intrinsically safe power supply, causing the intrinsically safe power supply to be unable to operate stably for a long time, thus making the intrinsically safe power supply The load capacity is poor, and the stable operation of the load equipment cannot be guaranteed. the

Therefore, it is necessary to propose a new type of intrinsically safe power supply for mine use. On the one hand, it can effectively prolong the standby time of the intrinsically safe power supply and ensure the stable operation of intrinsically safe equipment including the emergency avoidance system in the mine; on the other hand, it can effectively avoid The impact of the intrinsically safe power supply start-up high current on the internal circuit of the intrinsically safe power supply enhances the load carrying capacity of the intrinsically safe power supply. the

Utility model content

In view of this, the purpose of this utility model is to provide a graded start-up mine intrinsically safe power supply, on the one hand, it can effectively prolong the standby time of the intrinsically safe power supply, and ensure the stable operation of the intrinsically safe equipment including the emergency avoidance system in the mine ; On the other hand, it can effectively avoid the impact of high current on the internal circuit of the intrinsically safe power supply when the intrinsically safe power supply is started, and enhance the load capacity of the intrinsically safe power supply. the

The graded start-up mine intrinsically safe power supply provided by the utility model at least includes a DC/DC power supply unit that receives direct current and steps up or steps down the direct current, a safety barrier circuit, a battery pack, a power supply control circuit, and a battery power supply control A circuit, a voltage comparison unit and a control unit for obtaining the voltage of the battery pack and performing a comparison operation with the set reference voltage;

The DC/DC power supply unit is electrically connected to the safety barrier circuit through a power supply control circuit; the battery pack is electrically connected to the safety barrier circuit through a battery power supply control circuit; the input terminal of the voltage comparison unit is electrically connected to the battery pack connected, the output terminal is electrically connected to the DC/DC power supply unit, the control unit is powered by the DC/DC power supply unit and outputs control signals to the power supply control circuit and the battery power supply control circuit, and the control unit is also connected to the battery pack Positive electrical connection. the

Further, the voltage comparison unit is also provided with a comparison reference voltage setting circuit for reducing the comparison reference voltage value in the voltage comparison unit, the input terminal of the comparison reference voltage setting circuit is electrically connected to the control unit, and the output terminal is electrically connected to the voltage comparison unit. The input terminals of the unit are electrically connected. the

Further, the input terminal of the DC/DC power supply module is provided with a starting voltage setting circuit and a starting protection circuit, the input terminal of the starting protection circuit is connected to a DC power supply, and the output terminal of the starting protection circuit is connected to the starting voltage setting circuit and the DC power supply. The voltage setting terminal of the /DC power supply module is electrically connected, and the starting voltage setting circuit is electrically connected with the input terminal of the DC/DC power supply module. the

Further, the input terminal of the voltage comparison unit is provided with a current amplification circuit, and the current amplification circuit is used to obtain the battery current and output it to the voltage comparison unit after being amplified. the

Further, the power supply control circuit includes MOS transistor T1, MOS transistor T2, diode D6, transistor Q3, transistor Q4 and diode D5;

The source of the MOS transistor T1 is electrically connected to the output terminal of the DC/DC power supply unit, the drain of the MOS transistor T1 is electrically connected to the positive electrode of the diode D5, the negative electrode of the diode D5 is electrically connected to the positive electrode of the battery pack, and the MOS transistor T1 The gate of the transistor Q3 is electrically connected to the collector of the transistor Q3, the emitter of the transistor Q3 is grounded, the base of the transistor Q3 is electrically connected to the control unit; the source of the MOS transistor T2 is electrically connected to the source of the MOS transistor T1, and the source of the MOS transistor T2 The drain is electrically connected to the anode of the diode D6, the cathode of the diode D6 is electrically connected to the input terminal of the safety barrier circuit, the gate of the MOS transistor T2 is electrically connected to the collector of the transistor Q4, the emitter of the transistor Q4 is grounded, and the transistor Q4’s The base is electrically connected with the output terminal of the control unit. the

Further, the battery power supply control circuit includes a MOS transistor T3, a MOS transistor T4, a triode Q5 and a triode Q6;

The source of the MOS transistor T3 is electrically connected to the positive pole of the battery pack, the drain of the MOS transistor T3 is electrically connected to the drain of the MOS transistor T4, and the source of the MOS transistor T4 is electrically connected to the input end of the safety barrier circuit. The gate of the MOS transistor T3 is electrically connected to the collector of the transistor Q5, the gate of the MOS transistor T4 is electrically connected to the collector of the transistor Q6, and the bases of the transistor Q5 and the transistor Q6 are both electrically connected to the output end of the control unit, so The emitters of the triode Q5 and the triode Q6 are grounded. the

Further, the voltage comparison unit includes an operational amplifier U1, a fourth resistor R4, an eighth resistor R8, a second resistor R2, a thirteenth resistor R13, a first capacitor C1, a fourth diode D4, and a fourteenth resistor R14 ;

The non-inverting terminal of the operational amplifier U1 is electrically connected to the output terminal of the current amplification circuit through the fourth resistor R4, the inverting terminal of the operational amplifier U1 is connected to one end of the eighth resistor R8, and the other end of the eighth resistor R8 is used as a reference The voltage input terminal, the output terminal of the operational amplifier U1 is electrically connected to the anode of the fourth diode D4, and the cathode of the fourth diode D4 is electrically connected to the DC/DC power supply through the fourteenth resistor R14; the operational amplifier U1 is electrically connected to the positive pole of the fourth diode D4; The output terminal of the amplifier U1 is electrically connected to the inverting terminal through the first capacitor and the thirteenth resistor R13 in series, and the inverting terminal of the operational amplifier U1 is also grounded through the second resistor R2. the

Further, the comparison reference voltage setting circuit includes a third resistor R3, a seventh resistor R7, a triode Q1 and a triode Q2;

The base of the triode Q2 is electrically connected to the output terminal of the control unit, the collector of the triode Q2 is electrically connected to the inverting terminal of the operational amplifier U1 through the seventh resistor R7, and the base of the triode Q1 is electrically connected to the output terminal of the control unit , the collector of the transistor Q1 is electrically connected to the inverting terminal of the operational amplifier U1 through the third resistor R3, and the emitters of the transistor Q1 and the transistor Q2 are grounded. the

Further, the startup voltage setting circuit includes a fifth resistor R5, a sixth resistor R6 and a fourth capacitor C4, the power setting terminal of the DC/DC power supply unit is grounded through the fourth capacitor C4, and the DC/DC power supply The power setting terminal of the unit is electrically connected to the output of the start-up protection circuit through the fifth resistor R5, and the power setting terminal of the DC/DC power supply unit is grounded through the sixth resistor R6. the

Further, the startup protection circuit includes a first diode D1, a second diode D2, a first resistor R1, a third diode D3 and a second capacitor C2, and the second capacitor is an electrolytic capacitor;

The positive pole of the first diode D1 is connected to the DC power supply as the input terminal of the intrinsically safe power supply, the negative pole of the first diode D1 is electrically connected to the positive pole of the second capacitor C2 through the first resistor R1, and the negative pole of the second capacitor Grounded, the anode of the second capacitor C2 is electrically connected to the anode of the third diode D3, the cathode of the third diode D3 is electrically connected to the input end of the DC/DC power supply unit, and the cathode of the first diode D1 is also connected to the The anode of the second diode D2 is electrically connected, and the cathode of the second diode D2 is electrically connected to the input terminal of the DC/DC power supply unit. the

The beneficial effects of the utility model:

The graded start-up intrinsically safe power supply for mines of the present invention operates with a small current when starting, and then gradually increases the working current until it becomes stable, so as to realize starting at different current levels, and can avoid the impact of the starting current of the intrinsically safe power supply on the intrinsically safe power supply , avoid the false triggering of the intrinsically safe power supply caused by the high current when the intrinsically safe power supply starts, and ensure the stable and long-lasting operation of the intrinsically safe power supply, thereby enhancing the load capacity of the input intrinsically safe power supply; on the other hand, adding The backup battery can effectively increase the backup time of the intrinsically safe power supply and ensure the stable operation of the intrinsically safe equipment including the emergency avoidance system in the mine. the

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model will be further described:

Fig. 1 is a functional block diagram of the utility model. the

Fig. 2 is the schematic circuit diagram of the utility model. the

Detailed ways

Fig. 1 is a functional block diagram of the present utility model, and Fig. 2 is a circuit schematic diagram of the present utility model, as shown in the figure, the graded start-up mine intrinsically safe power supply provided by the utility model at least includes receiving direct current (being the direct current of 24V) A DC/DC power supply unit, a safety barrier circuit, a battery pack BAT, a power supply control circuit, a battery power supply control circuit, and a DC/DC power supply unit that performs step-up or step-down processing of direct current, are used to obtain the current of the battery pack BAT and compare it with the set reference current A voltage comparison unit and a control unit for comparison operations;

The DC/DC power supply unit is electrically connected to the safety barrier circuit through a power supply control circuit; the battery pack is electrically connected to the safety barrier circuit through a battery power supply control circuit; the input terminal of the voltage comparison unit is electrically connected to the battery pack connected, the output terminal is electrically connected to the DC/DC power supply unit, the control unit is powered by the DC/DC power supply unit and outputs control signals to the power supply control circuit and the battery power supply control circuit, and the control unit is also connected to the battery pack The positive electrode is electrically connected; the graded start-up mine intrinsically safe power supply of the present invention operates with a small current when starting, and then gradually increases the working current until it is stable, so as to realize the starting of different current levels, and can avoid the impact of the starting current of the intrinsically safe power supply on the intrinsically safe power supply. The impact caused by the power supply can avoid the false triggering of the intrinsically safe power supply caused by the high current when the intrinsically safe power supply is started, and ensure the stable and long-lasting operation of the intrinsically safe power supply, thereby enhancing the load capacity of the input intrinsically safe power supply; on the other hand, in this Adding a backup battery to the safety power supply can effectively increase the backup time of the intrinsically safe power supply and ensure the stable operation of the intrinsically safe equipment including the emergency avoidance system in the mine. the

In this embodiment, the voltage comparison unit is also provided with a comparison reference voltage setting circuit for reducing the comparison reference voltage value in the voltage comparison unit, the input terminal of the comparison reference voltage setting circuit is electrically connected to the control unit, and the output terminal It is electrically connected with the input terminal of the voltage comparison unit, and by comparing the reference voltage setting circuit, the output current and power of the DC/DC power supply module can be adjusted to prolong the standby time of the intrinsically safe power supply and enhance the load capacity of the intrinsically safe power supply . the

In this embodiment, the input terminal of the DC/DC power supply module is provided with a starting voltage setting circuit and a starting protection circuit, the input terminal of the starting protection circuit is connected to a DC power supply, and the output terminal of the starting protection circuit is connected to the starting voltage setting circuit. The circuit is electrically connected to the voltage setting terminal of the DC/DC power supply module, and the starting voltage setting circuit is electrically connected to the input terminal of the DC/DC power supply module. the

In this embodiment, the input end of the voltage comparison unit is provided with a current amplifying circuit, and the current amplifying circuit is used to obtain the battery current and output it to the voltage comparing unit after amplifying. The current amplifying circuit includes a fifth capacitor C5, a Nine resistors R9, operational amplifier U2, tenth resistor R10, and eleventh resistor R11, the inverting terminal of the operational amplifier U2 is grounded through the tenth resistor R10, and the non-inverting terminal of the operational amplifier U2 is connected to the battery pack through the eleventh resistor R11 The negative electrode of the operational amplifier U2 is electrically connected, the fifth capacitor C5 and the ninth resistor R9 are connected in parallel and then connected between the inverting terminal and the output terminal of the operational amplifier U2, and the output terminal of the operational amplifier U2 is used as the output of the current amplification circuit end. the

In this embodiment, the power supply control circuit includes a MOS transistor T1 (MOS transistor is a metal oxide semiconductor field effect transistor), a MOS transistor T2, a diode D6, a triode Q3, a triode Q4, and a diode D5;

The source of the MOS transistor T1 is electrically connected to the output terminal of the DC/DC power supply unit, the drain of the MOS transistor T1 is electrically connected to the positive electrode of the diode D5, the negative electrode of the diode D5 is electrically connected to the positive electrode of the battery pack, and the MOS transistor T1 The gate of the transistor Q3 is electrically connected to the collector of the transistor Q3, the emitter of the transistor Q3 is grounded, the base of the transistor Q3 is electrically connected to the control unit; the source of the MOS transistor T2 is electrically connected to the source of the MOS transistor T1, and the source of the MOS transistor T2 The drain is electrically connected to the anode of the diode D6, the cathode of the diode D6 is electrically connected to the input end of the safety barrier circuit, the gate of the MOS transistor T2 is electrically connected to the collector of the transistor Q4, the emitter of the transistor Q4 is grounded, and the base of the transistor Q4 The pole is electrically connected with the output end of the control unit. the

In this embodiment, the battery power supply control circuit includes a MOS transistor T3, a MOS transistor T4, a triode Q5 and a triode Q6;

The source of the MOS transistor T3 is electrically connected to the positive pole of the battery pack, the drain of the MOS transistor T3 is electrically connected to the drain of the MOS transistor T4, and the source of the MOS transistor T4 is electrically connected to the input terminal of the safety barrier circuit. The grid of the MOS transistor T3 is electrically connected to the collector of the transistor Q5, the grid of the MOS transistor T4 is electrically connected to the collector of the transistor Q6, and the bases of the transistor Q5 and the transistor Q6 are both electrically connected to the output terminal of the control unit, so The emitters of the triode Q5 and the triode Q6 are grounded, and the battery pack is also grounded through the twelfth resistor R12. the

In this embodiment, the voltage comparison unit includes an operational amplifier U1, a fourth resistor R4, an eighth resistor R8, a second resistor R2, a thirteenth resistor R13, a first capacitor C1, a fourth diode D4, and a tenth resistor Four resistors R14;

The non-inverting terminal of the operational amplifier U1 is electrically connected to the output terminal of the current amplifying circuit through the fourth resistor R4, and through the effect of the current amplifying circuit and the fourth resistor R4, the input of the non-inverting terminal of the operational amplifier U1 is proportional to the charging current of the battery. Voltage, the inverting end of the operational amplifier U1 is connected to one end of the eighth resistor R8, the other end of the eighth resistor R8 is used as the reference voltage input end, the reference voltage is 2.5V, and the reference voltage is added to the eighth resistor R8 after passing through the eighth resistor R8 The inverting terminal of the operational amplifier U1, the output terminal of the operational amplifier U1 is electrically connected to the positive pole of the fourth diode D4, and the negative pole of the fourth diode D4 is electrically connected to the DC/DC power supply through the fourteenth resistor R14 The output terminal of the operational amplifier U1 is electrically connected to the inverting terminal through the first capacitor and the thirteenth resistor R13 in series, and the inverting terminal of the operational amplifier U1 is also grounded through the second resistor R2. the

In this embodiment, the comparison reference voltage setting circuit includes a third resistor R3, a seventh resistor R7, a triode Q1 and a triode Q2;

The base of the triode Q2 is electrically connected to the output terminal of the control unit, the collector of the triode Q2 is electrically connected to the inverting terminal of the operational amplifier U1 through the seventh resistor R7, and the base of the triode Q1 is electrically connected to the output terminal of the control unit , the collector of the transistor Q1 is electrically connected to the inverting terminal of the operational amplifier U1 through the third resistor R3, and the emitters of the transistor Q1 and the transistor Q2 are grounded. the

In this embodiment, the startup voltage setting circuit includes a fifth resistor R5, a sixth resistor R6, and a fourth capacitor C4, the power setting terminal of the DC/DC power supply unit is grounded through the fourth capacitor C4, and the DC The power setting end of the /DC power supply unit is electrically connected to the output of the start protection circuit through the fifth resistor R5, and the power setting end of the DC/DC power supply unit is grounded through the sixth resistor R6. the

In this embodiment, the startup protection circuit includes a first diode D1, a second diode D2, a first resistor R1, a third diode D3, and a second capacitor C2, and the second capacitor is an electrolytic capacitor ;

The positive pole of the first diode D1 is connected to the DC power supply as the input terminal of the intrinsically safe power supply, the negative pole of the first diode D1 is electrically connected to the positive pole of the second capacitor C2 through the first resistor R1, and the negative pole of the second capacitor Grounded, the anode of the second capacitor C2 is electrically connected to the anode of the third diode D3, the cathode of the third diode D3 is electrically connected to the input end of the DC/DC power supply unit, and the cathode of the first diode D1 is also connected to the The anode of the second diode D2 is electrically connected, and the cathode of the second diode D2 is electrically connected to the input terminal of the DC/DC power supply unit. Through the first diode D1 and the second diode D2, the second The reverse current of the capacitor C2 and the third capacitor C3 affects safety. the

The working principle of the utility model:

In the voltage comparison unit, the inverting input terminal of the operational amplifier U1 is the reference voltage, and the reference voltage is compared with the input voltage of the non-inverting terminal of the operational amplifier U1 (the voltage is proportional to the charging current of the battery). When the non-inverting input terminal of the operational amplifier U1 The input voltage at the terminal is higher than the reference voltage of the inverting terminal of the operational amplifier U1, the output terminal of the operational amplifier U1 will output a high level, and the high level will be fed back to the DC/DC power supply control pin FB to make the output terminal voltage of the DC/DC power supply When the output voltage of the DC/DC power supply decreases, the charging current of the battery will decrease; and when the input voltage of the non-inverting terminal of the operational amplifier U1 is lower than the reference voltage of the inverting terminal of the operational amplifier U1, the output terminal of the operational amplifier U1 will output a low voltage. The low level will be fed back to the DC/DC power supply control pin FB to make the output voltage of the DC/DC power supply higher, and the increase in the output voltage of the DC/DC power supply will lead to an increase in the charging current of the battery. the

In the comparative reference voltage setting circuit, when both IC1 and IC2 are at high level, both transistor Q1 and transistor Q2 are turned on, and the input voltage of the inverting terminal of operational amplifier U1 will become the minimum value at this time; while IC1 and IC2 When both are at low level, both transistor Q1 and transistor Q2 are cut off, at this time the input voltage of the inverting terminal of operational amplifier U1 will become the maximum value, and when IC1 is at high level and IC2 is at low level, transistor Q1 is turned on , Transistor Q2 is cut off, at this time the input voltage of the inverting terminal of operational amplifier U1 will become the set intermediate value. In this way, the charging current value of the storage battery can be controlled by setting the voltage value of the input voltage of the inverting terminal of the operational amplifier U1. the

When the present invention is powered on, the second capacitor C2 is first charged, and the DC/DC power supply module is delayed to start, which can avoid the influence of voltage instability on the DC/DC power supply module. When the voltage is stable, the starting voltage setting circuit passes the DC The enabling terminal Enable of the /DC power supply module inputs the starting voltage, and the DC/DC power supply module starts, and the DC/DC power supply module outputs a stable voltage, and supplies power to the VDC end of the control unit (the control unit of the present invention adopts a single-chip microcomputer), and the control unit Start, and the IC1, IC2 and CH terminals of the control unit output high level, the inverting terminal voltage of the operational amplifier U1 is the lowest, and the control unit terminals FD1, FD2 and DHC output low level, so that the MOS transistor T1, transistor Q1 and triode The stage tube Q2 is turned on, and the MOS tube T3, MOS tube T4 and MOS tube T2 are all off. At this time, the operational amplifier U1 outputs a high level and feeds it back to the DC/DC power module so that the DC/DC power module outputs a low voltage. And charge the storage battery with a small current, and make the power of the safety barrier circuit output the lowest (no output), there is a voltage value in the sixth capacitor C6, and the present invention completes the start;

When the IC1 terminal of the control unit outputs a level, while the IC2 terminal outputs a high level, the input voltage of the inverting terminal of the op amp U1 is at an intermediate value, so the op amp U1 feeds back the control signal to the DC/DC power module to make the DC/DC power supply The module output voltage gradually rises to the middle value, so that the battery charging current gradually rises to the middle value. At this time, the control unit continues to output control commands, so that the IC1 terminal and IC2 terminal output low level, and the operational amplifier U1 outputs low level. Make the DC/DC power module output high-voltage power supply, and the charging current of the battery continues to increase to a large current. When the charging current of the battery reaches the set value (detected by the control unit), the control unit makes the terminals FD1 and DHC output high level , control the conduction of MOS tube T2, the DC/DC power supply module directly supplies power to the safety barrier circuit, the safety barrier circuit outputs current to the load, and the MOS tube T3 is also turned on, because there is a freewheeling diode in the MOS tube, the battery power supply path is here At this time, the voltage of the battery is lower than the negative voltage of the diode D6 and no power is supplied to the outside;

When there is no external direct current input, the output power of the intrinsically safe power supply is completely provided by the battery, and the output voltage of the battery is output through the safety barrier circuit, and the control unit is powered by the battery to completely open the power supply path of the battery. the

When the intrinsically safe power supply needs cascading equipment, the terminals IC1 and IC2 of the control unit output high level at the same time, so that the DC/DC power supply module outputs low voltage and reduces the output current. the

Finally, it should be noted that the above embodiments are only used to illustrate the technical aspects of the present utility model and are not limiting. Although the utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the utility model can be Modifications or equivalent replacements of the technical aspects of the present utility model without departing from the purpose and scope of the technical aspects of the present utility model shall be covered by the scope of claims of the present utility model. the

Claims (10)

1. a stepped starting type mine intrinsic safety electric source, is characterized in that: at least comprise receive direct current and direct current is boosted or DC/DC power subsystem that step-down is processed, safety barrier circuit, batteries, Power supply control circuit, storage battery power supply control circuit, for obtaining the voltage of batteries and comparing voltage comparison unit and the control unit of computing with the reference voltage arranging;

Described DC/DC power subsystem is electrically connected to described safety barrier circuit by Power supply control circuit; Described batteries is electrically connected to described safety barrier circuit by storage battery power supply control circuit; Described voltage comparison unit input is electrically connected to batteries, output is electrically connected to DC/DC power subsystem, described control unit is powered by DC/DC power subsystem and to Power supply control circuit and storage battery power supply control circuit output control signal, described control unit is also electrically connected to the positive pole of described batteries.

2. stepped starting type mine intrinsic safety electric source according to claim 1, it is characterized in that: described voltage comparison unit is also provided with the comparison reference voltage initialization circuit for reducing the comparison reference voltage value in voltage comparison unit, described comparison reference voltage initialization circuit input is electrically connected to control unit, and output is electrically connected to the input of voltage comparison unit.

3. stepped starting type mine intrinsic safety electric source according to claim 2; it is characterized in that: the input of described DC/DC power module is provided with starting resistor initialization circuit and starting protection circuit; the input termination DC power supply of described starting protection circuit; the output of starting protection circuit is set end with the voltage of starting resistor initialization circuit and DC/DC power module and is electrically connected to, and described starting resistor initialization circuit is electrically connected to the input of DC/DC power module.

4. stepped starting type mine intrinsic safety electric source according to claim 3, is characterized in that: the input of described voltage comparison unit is provided with current amplification circuit, and described current amplification circuit is used for obtaining storage battery and flows through and amplify backward voltage comparison unit output.

5. stepped starting type mine intrinsic safety electric source according to claim 1, is characterized in that: described Power supply control circuit comprises metal-oxide-semiconductor T1, metal-oxide-semiconductor T2, diode D6, triode Q3, triode Q4 and diode D5;

The source electrode of described metal-oxide-semiconductor T1 is electrically connected to DC/DC power subsystem output, the drain electrode of described metal-oxide-semiconductor T1 is electrically connected to the positive pole of diode D5, the negative pole of diode D5 is electrically connected to the positive pole of batteries, the grid of metal-oxide-semiconductor T1 is electrically connected to the collector electrode of triode Q3, the grounded emitter of triode Q3, the base stage of triode Q3 is electrically connected to control unit; The source electrode of metal-oxide-semiconductor T2 is electrically connected to the source electrode of metal-oxide-semiconductor T1, the drain electrode of metal-oxide-semiconductor T2 is electrically connected to the positive pole of diode D6, the negative pole of diode D6 is electrically connected to the input of safety barrier circuit, the grid of metal-oxide-semiconductor T2 is electrically connected to the collector electrode of triode Q4, the grounded emitter of triode Q4, the base stage of triode Q4 is electrically connected to the output of control unit.

6. stepped starting type mine intrinsic safety electric source according to claim 1, is characterized in that: described storage battery power supply control circuit comprises metal-oxide-semiconductor T3, metal-oxide-semiconductor T4, triode Q5 and triode Q6;

The source electrode of described metal-oxide-semiconductor T3 is electrically connected to the positive pole of batteries, the drain electrode of metal-oxide-semiconductor T3 is electrically connected to the drain electrode of metal-oxide-semiconductor T4, the source electrode of metal-oxide-semiconductor T4 is electrically connected to the input of safety barrier circuit, the grid of described metal-oxide-semiconductor T3 is electrically connected to the collector electrode of triode Q5, the grid of metal-oxide-semiconductor T4 is electrically connected to the collector electrode of triode Q6, the base stage of described triode Q5 and triode Q6 is all electrically connected to control unit output, the grounded emitter of described triode Q5 and triode Q6.

7. stepped starting type mine intrinsic safety electric source according to claim 1, is characterized in that: described voltage comparison unit comprises amplifier U1, the 4th resistance R 4, the 8th resistance R 8, the second resistance R the 2, the 13 resistance R 13, the first capacitor C 1, the 4th diode D4 and the 14 resistance R 14;

The in-phase end of described amplifier U1 is electrically connected to the output of current amplification circuit by the 4th resistance R 4, the end of oppisite phase of described amplifier U1 is connected with one end of the 8th resistance R 8, the other end of the 8th resistance R 8 is as reference voltage input, the output of described amplifier U1 is electrically connected to the positive pole of the 4th diode D4, and the negative pole of the 4th diode D4 is electrically connected to DC/DC power supply power supply by the 14 resistance R 14; The output of described amplifier U1 is electrically connected to end of oppisite phase after connecting by the first electric capacity and the 13 resistance R 13, and the end of oppisite phase of described amplifier U1 is also by the second resistance R 2 ground connection.

8. stepped starting type mine intrinsic safety electric source according to claim 2, is characterized in that: described comparison reference voltage initialization circuit comprises the 3rd resistance R 3, the 7th resistance R 7, triode Q1 and triode Q2;

The base stage of described triode Q2 is electrically connected to the output of control unit, the collector electrode of triode Q2 is electrically connected to the end of oppisite phase of amplifier U1 by the 7th resistance R 7, the base stage of triode Q1 is electrically connected to the output of control unit, the collector electrode of triode Q1 is electrically connected to the end of oppisite phase of amplifier U1 by the 3rd resistance R 3, the grounded emitter of described triode Q1 and triode Q2.

9. stepped starting type mine intrinsic safety electric source according to claim 3; it is characterized in that: described starting resistor initialization circuit comprises the 5th resistance R 5, the 6th resistance R 6 and the 4th capacitor C 4; the power settings end of described DC/DC power subsystem is by the 4th capacitor C 4 ground connection; the power settings end of described DC/DC power subsystem is electrically connected to the output of starting protection circuit by the 5th resistance R 5, and the power settings end of described DC/DC power subsystem is by the 6th resistance R 6 ground connection.

10. stepped starting type mine intrinsic safety electric source according to claim 3, it is characterized in that: described starting protection circuit comprises the first diode D1, the second diode D2, the first resistance R 1, the 3rd diode D3 and the second capacitor C 2, and described the second electric capacity is electrochemical capacitor;

The positive pole of described the first diode D1 with as the input termination DC power supply of intrinsic safety electric source, the negative pole of the first diode D1 is electrically connected to the positive pole of the second capacitor C 2 by the first resistance R 1, the minus earth of the second electric capacity, the positive pole of the second capacitor C 2 is electrically connected to the positive pole of the 3rd diode D3, the negative pole of the 3rd diode D3 is electrically connected to the input of DC/DC power subsystem, the negative pole of the first diode D1 is also electrically connected to the positive pole of the second diode D2, and the negative pole of the second diode D2 is electrically connected to the input of DC/DC power subsystem.