Switch control device, method and mining-used cast-in-place intrinsically safe DC voltage-stabilized power supply

Abstract

The embodiments of this specification disclose a switch control device, a control method, and a cast-in-place intrinsically safe DC regulated power supply for mining. The switch control device includes: a button arranged on the intrinsically safe side of the power supply and a control circuit arranged on the non-safe side of the power supply, and a photoelectric coupler for isolating the button and the control circuit. When in use, by pressing the button arranged on the intrinsically safe side of the power supply, the photoelectric coupler is triggered to generate a control signal on the non-safe side of the power supply, and the on and off of the transistor switch circuit is controlled by the control signal, so that the purpose of convenient operation can be achieved under the condition that the power supply is completely cast-in-place and meets the intrinsic safety requirements. The technical solution of the present invention adopts ordinary buttons and photoelectric couplers, does not require explosion-proof devices, and has the beneficial effects of convenient operation, low cost, and easy replacement of wearing parts.

Description

Technical Field

[0001] The present specification relates to the field of mining power supplies, and in particular to a switch control device, a control method, and a mining-used cast-in-place intrinsically safe DC regulated power supply. Background Art

[0002] Mining equipment in coal mines must be safe and stable. In the absence of a backup power supply, once a power outage causes communication interruption in the mining equipment, it will have a serious impact on production operations in the coal mine and affect the lives of underground miners.

[0003] The intrinsically safe power supply for mining is a type of mining equipment, which is divided into two types of explosion-proof: flameproof and cast-in-place. Among them, the cast-in-place and intrinsically safe DC regulated power supply for mining (also referred to as "cast-in-place intrinsically safe DC regulated power supply for mining" or simply "cast-in-place power supply" in this manual) has the advantages of small size, light weight, and easy mobility. The cast-in-place intrinsically safe DC regulated power supply for mining is divided into two types: with backup (i.e. built-in battery) function and without backup (i.e. no built-in battery) function. The most commonly used one is the cast-in-place and intrinsically safe DC regulated power supply with backup function (referred to as "backup cast-in-place power supply" in this manual). Except for the intrinsically safe DC voltage output terminals and the communication terminals with intrinsic safety characteristics that can be directly exposed on the free surface of the cast-in-place compound, the other non-safe parts of the backup cast-in-place power supply cannot be exposed outside the free surface of the cast-in-place compound.

[0004] Before the backup encapsulation power supply is put into operation, the connection between the internal battery pack and the power circuit body needs to be disconnected to reduce battery discharge. Therefore, the on-off control between the output end of the battery pack and the input end of the power circuit body needs to be performed. At the same time, as an electrical device, the encapsulation power supply also needs to be switched on and off during use. The existing technology generally connects the encapsulation power supply through the communication terminal on the intrinsically safe side of the power supply, and remotely controls it. This control method is very inconvenient to use in mines.

[0005] Therefore, for the encapsulated power supply, a convenient control solution that meets the safety requirements of mining is urgently needed to achieve the switching control of the power supply. Summary of the invention

[0006] The embodiments of this specification provide a switch control device, a control method and a cast-in-place intrinsically safe DC regulated power supply for mining, which are used to solve the technical problem of inconvenient control of a backup cast-in-place power supply for mining.

[0007] To solve the above technical problems, the embodiments of this specification are implemented as follows:

[0008] The embodiment of this specification provides a switch control device, which is suitable for a cast-in-place intrinsically safe DC regulated power supply for mining, and the switch control device includes:

[0009] A button disposed on the intrinsically safe side of the power supply and a control circuit disposed on the non-safe side of the power supply, and a photoelectric coupler for isolating the button and the control circuit;

[0010] Wherein, the button is fixed on the housing of the power supply, one terminal of the button is used to connect to the positive output end of the intrinsically safe output module of the power supply, and the other terminal is connected to the first input end of the photoelectric coupler through a current limiting resistor; the photoelectric coupler is encapsulated inside the power supply, the second input end of the photoelectric coupler is used to connect to the negative output end of the intrinsically safe output module, the output end of the photoelectric coupler is connected to the control circuit, and outputs a control signal to the control circuit based on pressing the button; the control circuit is encapsulated inside the power supply and is used to connect to the controlled module inside the power supply.

[0011] According to the switch control device of the embodiment of this specification, the control circuit includes a transistor switch unit, and the transistor switch unit is used to connect the output end of the battery pack inside the power supply or the output end of the AC input module, and control the on and off of the battery pack or the AC input module through the control signal, wherein the battery pack and the AC input module are both cast inside the power supply.

[0012] According to the switch control device of the embodiment of the present specification, the button is a self-reset button, and when the self-reset button is pressed, it triggers the photoelectric coupler to output a pulse signal to control the on and off of the transistor switch unit.

[0013] According to the switch control device of the embodiment of this specification, the control circuit also includes a latch circuit connected between the output end of the photocoupler and the transistor switch unit, which is used to convert the pulse signal output by the photocoupler into a level signal to control the on and off of the transistor switch unit.

[0014] According to the switch control device of the embodiment of this specification, the button is a self-locking button, and after being pressed, the self-locking button triggers the photoelectric coupler to output a level signal to control the on and off of the transistor switch unit.

[0015] According to the switch control device of the embodiment of this specification, the photoelectric coupler includes a light emitting diode, the anode of the light emitting diode is the first input terminal of the photoelectric coupler, connected to the button through a current limiting resistor, and the cathode of the light emitting diode is the second input terminal of the photoelectric coupler, which is used to connect to the negative output terminal of the intrinsically safe output module.

[0016] According to the switch control device of the embodiment of the present specification, the control circuit includes a current line connected to the monitoring and communication module inside the power supply, and the button is a self-reset button. After pressing the self-reset button, it triggers the photoelectric coupler to input a pulse signal to the monitoring and communication module, wherein the monitoring and communication module is encapsulated inside the power supply.

[0017] The embodiments of this specification also provide a switch control method applicable to a cast-in-place intrinsically safe DC regulated power supply for mining, wherein the power supply uses the switch control device as described above to control the power supply.

[0018] The embodiment of this specification also provides a cast-in-place intrinsically safe DC regulated power supply for mining, the power supply comprising:

[0019] The intrinsically safe output module, battery pack, AC input module, and

[0020] A first switch control device, one end of which is connected to the output end of the intrinsically safe output module, and the other end of which is connected to the output end of the battery pack;

[0021] A second switch control device, one end of which is connected to the output end of the intrinsically safe output module, and the other end of which is connected to the output end of the AC input module;

[0022] The first switch control device or the second switch control device includes a button arranged on the intrinsically safe side and a control circuit arranged on the non-safe side, and a photoelectric coupler for isolating the button and the control circuit; wherein the button is fixed on the power supply housing, one terminal of the button is connected to the positive output end of the intrinsically safe output module, and the other terminal is connected to the first input end of the photoelectric coupler through a current limiting resistor; the photoelectric coupler and the control circuit are both encapsulated inside the power supply, the second input end of the photoelectric coupler is connected to the negative output end of the intrinsically safe output module, the output end of the photoelectric coupler is connected to the control circuit, and a control signal is output to the control circuit based on pressing the button.

[0023] According to the power supply of the embodiment of the present specification, the power supply also includes a monitoring communication module encapsulated inside the power supply, and a third switch control device, one end of the third switch control device is connected to the output end of the intrinsically safe output module, and the other end is connected to the monitoring communication module to input a control signal to the monitoring communication module.

[0024] The embodiments of this specification adopt at least one of the above technical solutions to achieve the following beneficial effects: using a photoelectric coupler to isolate the button on the intrinsically safe side and the control circuit on the non-intrinsically safe side, pressing the button on the intrinsically safe side during use triggers the photoelectric coupler to generate a control signal on the non-safe side of the power supply, and the on and off of the circuit is controlled by the control signal. When a switch control device is set in the power supply, it can be connected to the circuit module inside the power supply according to the needs to realize the control of the input and output of the cast-in power supply. It can also disconnect the path between the battery pack output and the main circuit of the power supply before the power supply is put into operation, solve the problem of the battery discharging through the main circuit during the transportation, storage, installation, and battery passing through the non-operation period of the power supply, extend the storage time of the backup cast-in-place power supply, prevent damage caused by over-discharge of the battery, and realize the interaction with the microcontroller with monitoring and communication functions inside the power supply, so as to achieve various convenient control purposes under the condition that the power supply is completely cast-in-place and meets the intrinsic safety requirements. At the same time, the switch device uses ordinary buttons and photoelectric couplers, no explosion-proof devices are required, and the buttons are installed on the cast-in-place power supply shell, and are not cast-in-place. Therefore, the switch control device or power supply of the embodiment of this specification also has the characteristics of simple structure, low cost and easy maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 A circuit diagram of a mine-used encapsulation power supply provided in an embodiment of this specification;

[0027] Figure 2 A block diagram of a switch control device applicable to a mine-used encapsulated power supply provided in an embodiment of this specification;

[0028] Figure 3 The installation structure diagram of the internal components of the mine-used encapsulated power supply provided in the embodiment of this specification;

[0029] Figure 4 This is a circuit structure diagram of the first embodiment using a self-reset button to control the output of the AC / DC module;

[0030] Figure 5 This is a circuit structure diagram of the second embodiment using a self-locking button to control the output of the AC / DC module;

[0031] Figure 6 This is a circuit structure diagram of the third embodiment using a self-reset button to control the output of the battery pack;

[0032] Figure 7 This is a circuit structure diagram of the fourth embodiment using a self-locking button to control the output of the battery pack;

[0033] Figure 8 This is a structural block diagram of the mining encapsulation power supply provided in the embodiments of this specification. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments of this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

[0035] First, the basic structure of the mine-used cast-in-place intrinsically safe DC regulated power supply (referred to as "cast-in-place power supply") is introduced. Figure 1 As shown, it is a structure of a cast-in-place power supply provided in the embodiment of this specification, and the main part of the cast-in-place power supply includes: an AC conversion (AC / DC) module 1, a battery pack 2, a charging module 3, a monitoring and communication module 4, and an intrinsically safe output (DC / DC) module 5. Among them, the AC / DC module is used to convert the input AC power of the mains into DC power, and provide it to the DC / DC module or power the battery pack; the DC / DC module is used to realize DC voltage stabilization conversion and output intrinsically safe voltage; the battery pack is used to power the cast-in-place power supply; the monitoring and communication module is integrated with an MCU, which can receive input signals to realize the human-computer interaction between the user and the power supply (MCU is used to represent the monitoring and communication module in the following description); the charging module is used to realize the function of charging the battery pack when the mains is powered.

[0036] exist Figure 1 In the encapsulated power supply shown, except for the output end of the intrinsically safe output module, the rest are non-intrinsically safe parts (also called "non-safe side"), which are not allowed to be exposed outside the encapsulation compound. There can be multiple intrinsically safe output modules in the encapsulated power supply to achieve multi-channel voltage output. For example, the power supply is equipped with three intrinsically safe output modules, which can output 12V, 18V, and 24V DC voltages respectively to meet application requirements.

[0037] The switch control device proposed in the embodiment of this specification can be arranged Figure 1 In the encapsulated power supply, a corresponding number of switch control devices can be set according to the number and requirements of the circuit modules to be controlled. Figure 1 The button 6, current limiting resistor 7 and optocoupler (i.e. photoelectric coupler) 8 in the dotted box 10 are arranged on the intrinsically safe side of the encapsulated power supply, while the control circuit of the switch control device is arranged on the non-safe side of the encapsulated power supply. Figure 1 There are 4 sets of switch control devices in the power supply, which respectively control the AC / DC module, battery pack, monitoring communication module, and other reserved controls.

[0038] The switch control device 200 provided in the embodiment of this specification is described in detail below with reference to the accompanying drawings.

[0039] like Figure 2 As shown, the switch control device 200 provided in the embodiment of the present specification includes: a button 210 arranged on the intrinsically safe side of the power supply and a control circuit 230 arranged on the non-safe side of the power supply, and a photoelectric coupler 220 for isolating the button and the control circuit; wherein the button is fixed on the housing of the power supply, one terminal of the button is used to connect to the positive output end of the intrinsically safe output module of the power supply, and the other terminal is connected to the first input end of the photoelectric coupler through a current limiting resistor; the photoelectric coupler is encapsulated inside the power supply, the second input end of the photoelectric coupler is used to connect to the negative output end of the intrinsically safe output module, the output end of the photoelectric coupler is connected to the control circuit, and outputs a control signal to the control circuit based on the pressing of the button; the control circuit is encapsulated inside the power supply and is used to connect to the controlled module inside the power supply.

[0040] The controlled modules inside the power supply include an AC input module, a battery pack or a monitoring communication module.

[0041] According to the switch control device provided in the embodiment of this specification, the photoelectric coupler includes a light emitting diode, the anode of the light emitting diode is the first input terminal of the photoelectric coupler, connected to the button through a current limiting resistor, and the cathode of the light emitting diode is the second input terminal of the photoelectric coupler, which is used to connect the negative output terminal of the intrinsically safe output module.

[0042] The photoelectric coupler also includes a phototransistor. When the light-emitting diode emits light, the phototransistor senses light and conducts, outputting a low level. When the light-emitting diode does not emit light, the phototransistor is cut off and outputs a high level. The photoelectric coupler is combined with a circuit composed of a resistor, a voltage-stabilizing diode, and a capacitor to output a stable level control signal without jitter interference to the control circuit.

[0043] According to the switch control device provided in the embodiment of this specification, the control circuit includes a transistor switch unit, and the transistor switch unit is used to connect the output end of the battery pack inside the power supply or the output end of the AC input module, and control the on and off of the battery pack or the AC input module through the control signal, wherein the battery pack and the AC input module are both cast inside the power supply.

[0044] The circuit of the transistor switch unit can adopt a high-end control mode, wherein the switch power element adopts a PMOS tube or a PNP transistor. The circuit of the transistor switch unit can also adopt a low-end control mode, wherein the switch power element adopts an NMOS tube or an NPN transistor. The drive circuit and discharge path of the switch power element are formed by combining a resistor, a MOS tube and a switch diode. The transistor switch unit can also adopt a MOS tube or an IGBT tube.

[0045] According to the switch control device provided in the embodiment of this specification, the button is a self-reset button, and when the self-reset button is pressed, it triggers the photoelectric coupler to output a pulse signal to control the on and off of the transistor switch unit.

[0046] According to the switch control device provided in the embodiment of this specification, the control circuit also includes a latch circuit connected between the output end of the photoelectric coupler and the transistor switch unit, and is used to convert the pulse signal output by the photoelectric coupler into a level signal to control the on and off of the transistor switch unit.

[0047] After the reset button is pressed, it will automatically return to its initial position. Each time the reset button is pressed, a current of 2-3 mA is generated in the input circuit of the photocoupler, triggering the photocoupler to output a pulse signal. Each time the latch circuit receives a pulse, the output level is reversed and the state remains unchanged, thereby realizing the latch function. The output level is transmitted to the transistor switch unit through the output end of the latch circuit.

[0048] The latch circuit includes a D flip-flop, for example, an integrated circuit HEF4013 with dual D flip-flops, one of which can be used. The latch circuit also includes capacitors, resistors and Zener diodes. The specific connection method can be referred to Figure 4 Implementation.

[0049] According to the switch control device provided in the embodiment of this specification, the button is a self-locking button, and after being pressed, the self-locking button triggers the photoelectric coupler to output a level signal to control the on and off of the transistor switch unit.

[0050] The self-locking button will not return to its initial position after being pressed, and will reset only after the next press. After pressing the self-locking button, a current of 2-3 mA is generated in the input circuit of the photocoupler. The trigger photocoupler outputs a signal of a certain level, which is transmitted to the transistor switch unit for switch control.

[0051] By using the switch control device of the above-mentioned self-reset button + latch circuit structure, or the switch control device of the self-locking button structure, the output voltage of the battery pack of the mine-sealed power supply or the output voltage of the AC / DC module can be conveniently controlled under the premise of ensuring intrinsic safety, thereby achieving the purpose of overall control, battery switching, and battery activation.

[0052] In addition, the switch device provided in the embodiment of the present specification can also realize the function of conveniently interacting with a power supply with a microcontroller. Specifically, the control circuit includes a current line connected to the monitoring communication module inside the power supply, and the button is a self-reset button. After the self-reset button is pressed, it triggers the photoelectric coupler to input a pulse signal to the monitoring communication module, wherein the monitoring communication module is cast inside the power supply.

[0053] The monitoring communication module inside the encapsulated power supply receives the input pulse signal and performs corresponding actions according to the pre-set settings, such as restarting or resetting, thereby realizing the human-computer interaction between the user and the power supply. Compared with the existing technology of remote control by connecting the communication terminal on the intrinsically safe side of the power supply, the switch control device can achieve great convenience while ensuring safety, and is particularly suitable for application in special environments such as underground mines.

[0054] When the switch control device 200 provided in the embodiment of this specification is set in the encapsulated power supply, reference can be made to Figure 3 Installation diagram of the .

[0055] like Figure 3 As shown, the button 32 is fixed on the housing 31 of the encapsulated power supply, one terminal of the button 32 is connected to the wire 37, connected to the main circuit board 35 through the current limiting resistor, and the other terminal is connected to the positive output terminal of the intrinsically safe output module. The main circuit board 35 and the battery pack are both fixed on the fixed movement 33 and encapsulated in the compound 34. The button 32 and the connecting wire 37 are intrinsically safe parts, are not encapsulated, and are exposed outside the free surface 36 of the compound.

[0056] Figure 3 In the specific connection mode on the intrinsically safe side, one terminal of the button 32 is connected to a current limiting resistor on the main circuit board 35 through a connecting wire 37, thereby connecting to the first input terminal of the photoelectric coupler (for example, the anode of the light-emitting diode of the photoelectric coupler). The other terminal of the button 32 is connected to the positive output terminal of the intrinsically safe output module. The second input terminal of the photoelectric coupler (for example, the cathode of the light-emitting diode) is connected to the negative output terminal of the intrinsically safe output module.

[0057] Depend on Figure 3It can be seen that the setting of the switch control device meets the requirements of intrinsic safety for mining and is easy to install. Through low-cost buttons and ordinary optical coupling devices, the operation and control of the main circuit of the encapsulated power supply are realized with the help of the intrinsically safe output circuit of the encapsulated power supply. The switch control device has a simple structure, low cost, is easy to produce, install and debug, and is convenient to replace buttons.

[0058] Based on the same inventive concept, the embodiment of this specification also provides a switch control method applicable to a cast-in-place intrinsically safe DC regulated power supply for mining, wherein the method uses the switch control device as described above to control the power supply.

[0059] The following is a specific embodiment of the switch control method for controlling the encapsulated power supply using the switch control device provided in this specification. For the convenience of explanation, from the perspective of circuit function, the switch control device is divided into an optocoupler input unit 1 on the intrinsically safe side, an optocoupler output unit 2 on the non-intrinsically safe side, a transistor switch unit 4, a latch circuit 3 and an MCU (monitoring communication module) 5.

[0060] Embodiment 1: Using a self-reset button to control the output of the AC / DC module.

[0061] like Figure 4 As shown, the switch control device of the first embodiment includes an optocoupler input unit 1 , an optocoupler output unit 2 , a latch circuit 3 and a transistor switch unit 4 .

[0062] (1) Optocoupler input unit 1, which is composed of a self-reset button K, a current limiting resistor R1 and a light-emitting diode of an optocoupler GD1 connected in series.

[0063] The cathode of the light-emitting diode of the optocoupler GD1 is connected to the negative electrode BA- of the intrinsically safe output module, the anode of the light-emitting diode of the optocoupler GD1 is connected to one end of the current-limiting resistor R1, the other end of the current-limiting resistor R1 is connected to a terminal of the self-reset button K, and the other terminal of the self-reset button K is connected to the positive electrode BA+ of the intrinsically safe output module.

[0064] Press the self-reset button K to generate a 2-3mA current in the optocoupler input circuit, and the light-emitting diode of GD1 lights up, generating a trigger signal.

[0065] (2) Optocoupler output unit 2, which is composed of resistor R2, voltage zener diode Z1, capacitor C1 and phototransistor GD1.

[0066] The phototransistor of GD1 is connected in series with the resistor R2, the upper end of R2 is connected to the positive electrode DC+ of the DC output on the non-intrinsically safe side, and the emitter (or source) of the phototransistor of GD1 is connected to the negative electrode DC- of the DC output on the non-intrinsically safe side.

[0067] The voltage zener diode Z1 and capacitor C1 are connected in parallel and connected between the emitter and collector (or source and drain) of the phototransistor of GD1. When the light-emitting diode of GD1 emits light, the phototransistor of GD1 senses light, and the phototransistor of GD1 is turned on, and a low level is output at point A. When the light-emitting diode of GD1 does not emit light, the phototransistor of GD1 is turned off, and a high level is output at point A. The voltage zener diode Z1 plays a role of level conversion, which can convert the output level into 12V, so that the latch circuit of the subsequent stage can operate reliably. The capacitor C1 plays a role of filtering and de-jittering, eliminating the jitter interference caused by the button K.

[0068] (3) Latch circuit 3, composed of capacitor C2, resistor R3, integrated circuit HEF4013, resistor R4, Zener diode Z2, and capacitor C3.

[0069] Integrated circuit HEF4013 is a dual D flip-flop. In this scheme, only D flip-flop 1 is used to form a divide-by-two frequency counter. Figure 4 As shown, the positive phase output terminal of the D flip-flop 1 (i.e., pin 1 of HEF4013) is connected to the input terminal of the transistor switch circuit 4, the negative phase output terminal of the D flip-flop 1 (i.e., pin 2 of HEF4013) is connected to the input terminal of the D flip-flop 1 (i.e., pin 5 of HEF4013), the clock input terminal of the D flip-flop 1 (i.e., pin 3 of HEF4013) is connected to the output terminal of the optocoupler, the reset terminal of the D flip-flop 1 (i.e., pin 4 of HEF4013) is grounded, and the set terminal of the D flip-flop 1 (i.e., pin 6 of HEF4013) is connected to the RC circuit composed of capacitor C2 and resistor R3. When the power is on, the D flip-flop 1 of HEF4013 is set, and the resistor R4, the voltage stabilizing diode Z2 and the capacitor C3 form a voltage stabilizing circuit to provide 12V power supply to HEF4013.

[0070] When the reset button K is pressed once, a pulse signal is generated. The output level of the clock input terminal of the D flip-flop 1 (i.e., pin 3 of HEF4013) is inverted once each time a pulse is received. After the inversion, the state remains unchanged, thus realizing the latching function. The output level is transmitted from the positive phase output terminal of the D flip-flop 1 (i.e., pin 1 of HEF4013) to the transistor switch unit 4 for switch control.

[0071] (4) Transistor switch unit 4, composed of resistors R5, R6, R7, R8, MOS tubes G1, G2 and switch diode Z3.

[0072] Resistors R5, R6, R8 and MOS tube G2 form the driving circuit of MOS tube G1. When resistors R6 and R7 are powered on, they provide a certain voltage for the gates of MOS tubes G1 and G2 to prevent malfunction of the MOS tubes. When the gate of the MOS tube is input at a low level, a discharge path is provided for the gate capacitance Cgs of the MOS tube to speed up the shutdown speed of the MOS tube.

[0073] The switch diode Z3 is connected in parallel to the resistor R7, and can provide a faster discharge path for the gate capacitance Cgs of the MOS tube G1 when the gate of the MOS tube G1 is at a low level.

[0074] The d-pole of the MOS tube G1 is connected to the positive pole of the output end of the AC / DC module, and the s-pole of G2 is connected to the negative pole of the output end of the AC / DC module. The AC / DC module is a circuit module in the encapsulated power supply that converts AC power from the mains into DC power. Its input end is connected to the mains, and its output end is connected to the transistor switch unit 4. By controlling the switch control device, the encapsulated power supply is switched on and off when the mains is supplied.

[0075] The working principle of the first embodiment is that after pressing and releasing the self-reset button K, the photoelectric coupler outputs a low pulse signal, which is latched by the latch circuit 3 to form a certain level signal, and the level signal controls the on-off of the transistor switch unit 4, thereby controlling the on-off of the circuit between the output voltage of the AC / DC module and the subsequent DC / DC intrinsically safe output module. At the same time, due to the use of the D trigger circuit, the circuit structure also has the advantage of strong anti-interference ability.

[0076] Since the self-reset button is used to generate a low pulse signal, the output pulse signal can be directly used as an interactive signal for the monitoring communication module. Therefore, in the first embodiment, the pulse signal output by the photoelectric coupler can also be directly input into the MCU module to realize the human-computer interaction of the monitoring communication.

[0077] Embodiment 2: Using a self-locking button to control the output of the AC / DC module.

[0078] like Figure 5 As shown, the switch control device of the second embodiment includes an optical coupler input unit 1, an optical coupler output unit 2 and a transistor switch unit 4;

[0079] (1) Optocoupler input unit 1 is composed of a self-locking button K, a current-limiting resistor R1 and a light-emitting diode of an optocoupler GD1 connected in series.

[0080] The cathode of the light-emitting diode of the optocoupler GD1 is connected to the negative electrode BA- of the intrinsically safe output module, the anode of the light-emitting diode of the optocoupler GD1 is connected to one end of the current-limiting resistor R1, the other end of the current-limiting resistor R1 is connected to one end of the self-locking button K, and the other end of the self-locking button K is connected to the positive electrode BA+ of the intrinsically safe output module.

[0081] Pressing the self-locking button K generates a 2-3mA current in the optocoupler input circuit, causing the light-emitting diode of GD1 to light up and generate a trigger level.

[0082] (2) Optocoupler output unit 2, which is composed of resistor R2, voltage zener diode Z1, capacitor C1 and phototransistor GD1.

[0083] The phototransistor of GD1 is connected in series with the resistor R2, the upper end of R2 is connected to the positive electrode DC+ of the DC output on the non-intrinsically safe side, and the emitter (or source) of the phototransistor of GD1 is connected to the negative electrode DC- of the DC output on the non-intrinsically safe side.

[0084] The voltage zener diode Z1 is connected in parallel with the capacitor C1 and then connected between the emitter and collector (or source and drain) of the phototransistor of GD1. When the light emitting diode of GD1 emits light, the phototransistor of GD1 senses light, and the phototransistor of GD1 is turned on, and a low level is output at point A. When the light emitting diode of GD1 does not emit light, the phototransistor of GD1 is turned off, and a high level is output at point A. The voltage zener diode Z1 plays a role of level conversion, which can convert the output level into 12V, and control the on and off of the subsequent transistor switch unit 4.

[0085] (3) Transistor switch unit 4, composed of resistors R3, R4, R5, R6, MOS tubes G1, G2 and switch diode Z2.

[0086] Resistors R3, R4, R5 and MOS tube G2 are the driving circuit of MOS tube G1; when resistors R4 and R6 are powered on, they provide a certain voltage for the gates of MOS tubes G1 and G2 to prevent MOS tubes from malfunctioning. When the MOS tube gate inputs a low level, a discharge path is provided for the MOS tube gate capacitor Cgs to speed up the MOS tube shutdown.

[0087] The switch diode Z2 is connected in parallel to the resistor R6, and when the gate of the MOS tube G1 is at a low level, a faster discharge path is provided for the gate capacitance Cgs of the MOS tube G1.

[0088] The d-pole of the MOS tube G1 is connected to the positive pole of the output end of the AC / DC module, and the s-pole of G2 is connected to the negative pole of the output end of the AC / DC module. The AC / DC module is a circuit module in the encapsulated power supply that converts AC power from the mains into DC power. Its input end is connected to the mains, and its output end is connected to the transistor switch unit 4. By controlling the switch control device, the encapsulated power supply is switched on and off when the mains is supplied.

[0089] The working principle of the second embodiment is that after pressing the self-locking button K, the photocoupler photoelectrically outputs a low-level signal, which can directly control the on-off of the transistor switch unit 4, thereby controlling the on-off of the circuit between the output voltage of the AC / DC module and the subsequent DC / DC intrinsically safe output module.

[0090] The second embodiment adopts a self-locking button, which can generate a certain level signal to control the switch without adding a latch circuit, and has a simpler structure.

[0091] Embodiment 3: Using a self-reset button to control the output of the battery pack.

[0092] like Figure 6 As shown, the circuit of the switch control device in the third embodiment includes an optocoupler input unit 1 , an optocoupler output unit 2 , a latch circuit 3 and a transistor switch unit 4 .

[0093] The optical coupling output unit 2 is connected to the positive and negative electrodes BAT+ and BAT- of the battery pack output terminal to realize the on-off control of the battery pack output. The structures and principles of other circuit units are the same as those of the first embodiment, and can be implemented with reference to the first embodiment.

[0094] Embodiment 4: Using a self-locking button to control the output of the battery pack.

[0095] like Figure 7 As shown, the circuit of the switch control device in the fourth embodiment includes an optocoupler input unit 1 , an optocoupler output unit 2 and a transistor switch unit 4 .

[0096] The optical coupling output unit 2 is connected to the positive and negative electrodes BAT+ and BAT- of the battery pack output terminal to realize the on-off control of the battery pack output. The structures and principles of other circuit units are the same as those of the first embodiment, and can be implemented with reference to the second embodiment.

[0097] Based on the same inventive concept, this specification also provides a mine-used encapsulated intrinsically safe DC regulated power supply 800, such as Figure 8 As shown, the power supply 800 includes:

[0098] An intrinsically safe output module 810, a battery pack 820, an AC input module 830, and a first switch control device 850, one end of which is connected to the output end of the intrinsically safe output module 810 and the other end is connected to the output end of the battery pack 820, and a second switch control device 860, one end of which is connected to the output end of the intrinsically safe output module 810 and the other end is connected to the output end of the AC input module 830;

[0099] The switch control device 850 or 860 includes a button arranged on the intrinsically safe side and a control circuit arranged on the non-safe side, and a photoelectric coupler for isolating the button and the control circuit; wherein the button is fixed on the power supply housing, one terminal of the button is connected to the positive output terminal of the intrinsically safe output module, and the other terminal is connected to the first input terminal of the photoelectric coupler through a current limiting resistor; the photoelectric coupler and the control circuit are both encapsulated inside the power supply, the second input terminal of the photoelectric coupler is connected to the negative output terminal of the intrinsically safe output module, the output terminal of the photoelectric coupler is connected to the control circuit, and a control signal is output to the control circuit based on pressing the button.

[0100] According to the power supply provided in the embodiment of this specification, the power supply further includes a module MCU850 for monitoring communication, which is encapsulated inside the power supply, and a third switch control device 870, one end of which is connected to the output end of the intrinsically safe output module 810, and the other end is connected to the monitoring communication module 870, so as to input a control signal to the monitoring communication module 870. The third switch control device 870 has the same structure as the first switch control device 850 or the second switch device 860.

[0101] The specific method of using the encapsulated power supply 800 provided with a switch control device provided in the embodiment of this specification to realize the overall control of the power supply, the on-off control of the battery pack and the mains input control can be implemented with reference to the above-mentioned embodiment.

[0102] The encapsulated power supply 800 provided in the embodiment of this specification realizes the operation and control of the main circuit of the encapsulated power supply through a simple button (self-locking button or self-reset button) and a common optocoupler device, and is powered by the intrinsically safe output circuit of the encapsulated power supply. The power supply has a simple structure, low cost, and is easy to produce, install and debug. Without increasing significant costs and meeting safety requirements, the practical problem that the encapsulated power supply cannot be controlled is solved, and it is suitable for promotion and application in special scenarios such as mining areas.

[0103] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0104] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0105] In the 1990s, improvements to a technology could be clearly distinguished as hardware improvements (for example, improvements to the circuit structure of diodes, transistors, switches, etc.) or software improvements (improvements to the method flow). However, with the development of technology, many improvements to the method flow today can be regarded as direct improvements to the hardware circuit structure. Designers almost always obtain the corresponding hardware circuit structure by programming the improved method flow into the hardware circuit. Therefore, it cannot be said that an improvement in a method flow cannot be implemented using a hardware entity module. For example, a programmable logic device (PLD) (such as a field programmable gate array (FPGA)) is such an integrated circuit whose logical function is determined by the user's programming of the device. Designers can "integrate" a digital system on a PLD by programming it themselves, without having to ask a chip manufacturer to design and produce a dedicated integrated circuit chip. Moreover, nowadays, instead of manually making integrated circuit chips, this kind of programming is mostly implemented with "logic compiler" software, which is similar to the software compiler used when developing and writing programs. The original code before compilation must also be written in a specific programming language, which is called hardware description language (HDL). There is not only one kind of HDL, but many kinds, such as ABEL (Advanced Boolean Expression Language), AHDL (Altera Hardware Description Language), Confluence, CUPL (Cornell University Programming Language), HDCal, JHDL (Java Hardware Description Language), Lava, Lola, MyHDL, PALASM, RHDL (Ruby Hardware Description Language), etc. The most commonly used ones are VHDL (Very-High-Speed ​​Integrated Circuit Hardware Description Language) and Verilog. Those skilled in the art should also be aware that it is easy to obtain a hardware circuit that implements the logical method flow by simply performing some logic programming on the method flow using the above-mentioned hardware description languages ​​and programming it into an integrated circuit.

[0106] The controller can be implemented in any appropriate manner. For example, the controller can take the form of a microprocessor or processor and a computer-readable medium storing a computer-readable program code (such as software or firmware) that can be executed by the (micro)processor, a logic gate, a switch, an application-specific integrated circuit (ASIC), a programmable logic controller, and an embedded microcontroller. Examples of controllers include, but are not limited to, the following microcontrollers: ARC625D, AtmelAT91SAM, Microchip PIC18F26K20, and SiliconeLabsC8051F320. The memory controller can also be implemented as part of the control logic of the memory. Those skilled in the art also know that in addition to implementing the controller in a purely computer-readable program code manner, the controller can be implemented in the form of a logic gate, a switch, an application-specific integrated circuit, a programmable logic controller, and an embedded microcontroller by logically programming the method steps. Therefore, this controller can be considered as a hardware component, and the devices included therein for implementing various functions can also be regarded as structures within the hardware component. Or even, the devices for implementing various functions can be regarded as both software modules for implementing the method and structures within the hardware component.

[0107] The systems, devices, modules or units described in the above embodiments may be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, the computer may be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0108] For the convenience of description, the above devices are described in terms of functions and are divided into various units. Of course, when implementing one or more embodiments of this specification, the functions of each unit can be implemented in the same or multiple software and / or hardware.

[0109] Those skilled in the art will appreciate that the embodiments of this specification may be provided as methods, systems, or computer program products. Therefore, the embodiments of this specification may be in the form of complete hardware embodiments, complete software embodiments, or embodiments in combination with software and hardware. Moreover, the embodiments of this specification may be in the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0110] This specification is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of this specification. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data optimization device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data optimization device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0111] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data optimization device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0112] These computer program instructions may also be loaded onto a computer or other programmable data optimization device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable device provide for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0113] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0114] The memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0115] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0116] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0117] The specification may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The specification may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules may be located in local and remote computer storage media including storage devices.

[0118] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0119] The above is only an embodiment of this specification and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A switch control device, suitable for a cast-in-place intrinsically safe DC regulated power supply for mining, characterized in that: The switch control device comprises: A button disposed on the intrinsically safe side of the power supply and a control circuit disposed on the non-safe side of the power supply, and a photoelectric coupler for isolating the button and the control circuit; Wherein, the button is fixed on the housing of the power supply, one terminal of the button is used to connect to the positive output terminal of the intrinsically safe output module of the power supply, and the other terminal is connected to the first input terminal of the photoelectric coupler through a current limiting resistor; The photoelectric coupler is cast inside the power supply, the second input end of the photoelectric coupler is used to connect to the negative output end of the intrinsically safe output module, the output end of the photoelectric coupler is connected to the control circuit, and outputs a control signal to the control circuit based on the pressing of the button; The control circuit is encapsulated inside the power supply and is used to connect the controlled module inside the power supply. The control circuit includes a transistor switch unit, which is used to connect the output end of the battery pack inside the power supply or the output end of the AC input module, and control the connection and disconnection with the battery pack or the AC input module through the control signal, wherein the battery pack and the AC input module are both encapsulated inside the power supply.

2. The switch control device according to claim 1, characterized in that: The button is a self-reset button, which triggers the photoelectric coupler to output a pulse signal to control the on and off of the transistor switch unit when pressed.

3. The switch control device according to claim 2, characterized in that: The control circuit also includes a latch circuit connected between the output end of the photocoupler and the transistor switch unit, and used for converting the pulse signal output by the photocoupler into a level signal to control the on and off of the transistor switch unit.

4. The switch control device according to claim 1, characterized in that: The button is a self-locking button. After being pressed, the self-locking button triggers the photoelectric coupler to output a level signal to control the on / off of the transistor switch unit.

5. The switch control device according to claim 1, characterized in that: The photoelectric coupler includes a light emitting diode, the anode of the light emitting diode is the first input terminal of the photoelectric coupler, connected to the button through a current limiting resistor, and the cathode of the light emitting diode is the second input terminal of the photoelectric coupler, used to connect to the negative output terminal of the intrinsically safe output module.

6. The switch control device according to claim 1, characterized in that: The control circuit includes a current line connected to the internal monitoring and communication module of the power supply, and the button is a self-reset button. After being pressed, the self-reset button triggers the photoelectric coupler to input a pulse signal to the monitoring and communication module, wherein the monitoring and communication module is encapsulated inside the power supply.

7. A switch control method, applicable to a cast-in-place intrinsically safe DC regulated power supply for mining, characterized in that: The switch control device as described in any one of claims 1 to 6 is used to control the switch of the power supply.

8. A cast-in-place intrinsically safe DC regulated power supply for mining, characterized in that: include: The intrinsically safe output module, battery pack, AC input module, and A first switch control device, one end of which is connected to the output end of the intrinsically safe output module, and the other end of which is connected to the output end of the battery pack; A second switch control device, one end of which is connected to the output end of the intrinsically safe output module, and the other end of which is connected to the output end of the AC input module; The first switch control device or the second switch control device includes a button arranged on the intrinsically safe side and a control circuit arranged on the non-safe side, and a photoelectric coupler for isolating the button and the control circuit; wherein the button is fixed on the power supply housing, one terminal of the button is connected to the positive output end of the intrinsically safe output module, and the other terminal is connected to the first input end of the photoelectric coupler through a current limiting resistor; the photoelectric coupler and the control circuit are both encapsulated inside the power supply, the second input end of the photoelectric coupler is connected to the negative output end of the intrinsically safe output module, the output end of the photoelectric coupler is connected to the control circuit, and a control signal is output to the control circuit based on the pressing of the button, wherein the control circuit includes a transistor switch unit, the transistor switch unit is used to connect the output end of the battery pack inside the power supply or the output end of the AC input module, and control the on-off with the battery pack or the AC input module through the control signal, wherein the battery pack and the AC input module are both encapsulated inside the power supply.

9. The power supply according to claim 8, characterized in that: The power supply also includes a monitoring communication module encapsulated inside the power supply, and a third switch control device, one end of the third switch control device is connected to the output end of the intrinsically safe output module, and the other end is connected to the monitoring communication module to input a control signal to the monitoring communication module.

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