Power supply device and electronic equipment

Abstract

The present invention relates to a power supply device and an electronic device, comprising: a first power supply input terminal, a second power supply input terminal, a power supply output terminal and a driving power supply unit; and a control unit configured to output a first control level or a second control level; a first driving unit and a second driving unit connected to the control unit and the driving power supply unit; a first power switch unit connected to the first driving unit, the first power supply input terminal and the power supply output terminal; a second power switch unit connected to the second driving unit, the second power supply input terminal and the power supply output terminal; a third driving unit connected to the first power switch unit; a fourth driving unit connected to the second power switch unit; the first driving unit connected to the fourth driving unit; and the second driving unit connected to the third driving unit. The implementation of the present invention can realize safe and reliable switching of batteries.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and more specifically, to a power supply device and electronic equipment. Background Art

[0002] For some electronic devices, such as a 36V powered lawn mower, since it is used outdoors, it needs to be powered by batteries. In order to increase its cruising time, two battery packs are usually used to power it. When one battery pack is exhausted, it switches to another battery pack for power supply. In the battery pack power supply, it is usually switched by switching the power tube to switch the power supply circuit of the battery pack. During the switching process, the current in the link may flow back to each other. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a power supply device and an electronic device in view of the above-mentioned technical defects of the prior art.

[0004] The technical solution adopted by the present invention to solve the technical problem is: construct a power supply device, including: a first power supply input terminal connectable to a first battery pack, a second power supply input terminal connectable to a second battery pack, a power supply output terminal for providing power output, and a driving power supply unit for outputting a driving power supply voltage; and

[0005] a control unit configured to output a first control level or a second control level;

[0006] a first driving unit connected to the control unit and the driving power supply unit and configured to output a first driving level when receiving the first control level;

[0007] a second driving unit connected to the control unit and the driving power supply unit and configured to output a second driving level when receiving the second control level;

[0008] A first power switch unit connected to the first driving unit, the first power supply input terminal and the power supply output terminal, and configured to be turned on when receiving the first driving level;

[0009] A second power switch unit connected to the second driving unit, the second power supply input terminal and the power supply output terminal, configured to be turned on when receiving the second driving level;

[0010] a third driving unit connected to the first power switch unit and configured to output a third driving level when the first power switch unit is turned on;

[0011] a fourth driving unit connected to the second power switch unit and configured to output a fourth driving level when the second power switch unit is turned on;

[0012] The first driving unit is connected to the fourth driving unit and is configured to be turned off when receiving the fourth driving level;

[0013] The second driving unit is connected to the third driving unit and is configured to be turned off when receiving the third driving level.

[0014] Preferably, the first power switch unit comprises a plurality of first power switch tube groups connected in series with the first power supply input terminal, and a series node of any of the first power switch tube groups is connected to the third driving unit.

[0015] Preferably, the first driving unit comprises a plurality of first driving switches correspondingly connected to the control ends of the plurality of first power switch tube groups; each of the first driving switches comprises: a first triode, a first MOS tube, a first diode, a first voltage regulator tube, a first resistor, a second resistor and a third resistor;

[0016] The base of the first triode is respectively connected to the anode of the first diode, the first end of the first resistor and the control unit, the cathode of the first diode is connected to the fourth driving unit, the second end of the first resistor is grounded, the emitter of the first triode is grounded, the collector of the first triode is connected to the gate of the first MOS tube via the second resistor, the source of the first MOS tube is respectively connected to the driving power supply unit, the cathode of the first voltage regulator tube and the first end of the third resistor, the anode of the first voltage regulator tube and the second end of the third resistor are connected to the gate of the first MOS tube, and the drain of the first MOS tube is connected to the control end of the first power switch tube group.

[0017] Preferably, the fourth driving unit includes a first switch unit and a second switch unit; the first end of the first switch unit is connected to the control unit, the second end of the first switch unit is connected to the second power switch unit, the third end of the first switch unit is connected to the first end of the second switch unit, the second end of the second switch unit is grounded, and the third end of the second switch unit is connected to the cathode of the first diode.

[0018] Preferably, the first switch unit includes a transistor Q5, a MOS transistor Q1, a voltage regulator Z11, a resistor R19, a resistor R22 and a resistor R27; the base of the transistor Q5 is connected to the control unit, the base of the transistor Q5 is grounded via the resistor R22, the emitter of the transistor Q5 is grounded, the collector of the transistor Q5 is respectively connected to the gate of the MOS transistor Q1, the anode of the voltage regulator Z11 and the first end of the resistor R19 via the resistor R27, the source of the MOS transistor Q1 is respectively connected to the cathode of the voltage regulator Z11, the second end of the resistor R19 and the second power switch unit, and the drain of the MOS transistor Q1 is connected to the first end of the second switch unit; and / or

[0019] The second switch unit includes a MOS tube Q21, a resistor R116, a resistor R118 and a capacitor C34; the gate of the MOS tube Q21 is connected to the third end of the first switch unit via the resistor R116, the gate of the MOS tube Q21 is also grounded via the resistor R118 and the capacitor C34 connected in parallel, the source of the MOS tube Q21 is grounded, and the drain of the MOS tube Q21 is connected to the cathode of the first diode.

[0020] Preferably, the second power switch unit comprises a plurality of second power switch tube groups connected in series with the second power supply input terminal, and a series node of any second power switch tube group is connected to the fourth driving unit.

[0021] Preferably, the second driving unit comprises a plurality of second driving switches correspondingly connected to the control ends of the plurality of second power switch tube groups; each of the second driving switches comprises: a second triode, a second MOS tube, a second diode, a second voltage regulator tube, a fourth resistor, a fifth resistor and a sixth resistor;

[0022] The base of the second triode is respectively connected to the anode of the second diode, the first end of the fourth resistor and the control unit, the cathode of the second diode is connected to the third driving unit, the second end of the fourth resistor is grounded, the emitter of the second triode is grounded, the collector of the second triode is connected to the gate of the second MOS tube via the fifth resistor, the source of the second MOS tube is respectively connected to the driving power supply unit, the cathode of the second voltage regulator tube and the first end of the sixth resistor, the anode of the second voltage regulator tube is connected to the second end of the sixth resistor and then connected to the gate of the second MOS tube, and the drain of the second MOS tube is connected to the control end of the second power switch tube group.

[0023] Preferably, the third driving unit includes a third switch unit and a fourth switch unit; the first end of the third switch unit is connected to the control unit, the second end of the third switch unit is connected to the second power switch unit, the third end of the third switch unit is connected to the first end of the fourth switch unit, the second end of the fourth switch unit is grounded, and the third end of the fourth switch unit is connected to the cathode of the second diode.

[0024] Preferably, the third switch unit includes a transistor Q3, a MOS transistor Q4, a voltage regulator Z10, a resistor R1, a resistor R13 and a resistor R17; the base of the transistor Q3 is connected to the control unit, the base of the transistor Q3 is grounded via the resistor R13, the emitter of the transistor Q3 is grounded, the collector of the transistor Q3 is respectively connected to the gate of the MOS transistor Q4, the anode of the voltage regulator Z10 and the first end of the resistor R1 via the resistor R17, the source of the MOS transistor Q4 is respectively connected to the cathode of the voltage regulator Z10, the second end of the resistor R1 and the first power switch unit, and the drain of the MOS transistor Q4 is connected to the first end of the fourth switch unit; and / or

[0025] The fourth switch unit includes a MOS tube Q17, a resistor R112, a resistor R113 and a capacitor C33; the gate of the MOS tube Q17 is connected to the third end of the third switch unit via the resistor R112, the gate of the MOS tube Q17 is also grounded via the resistor R113 and the capacitor C33 connected in parallel, the source of the MOS tube Q17 is grounded, and the drain of the MOS tube Q17 is connected to the cathode of the second diode.

[0026] Preferably, the driving power supply unit includes a fifth switch unit and a driving chip U5.

[0027] The first end of the fifth switch unit is connected to the control unit, the second end of the fifth switch unit is connected to a power supply, the third end of the fifth switch unit is connected to the power supply pin of the driving chip, the sixth pin and the seventh pin of the driving chip U5 are respectively connected to the control unit, and the twelfth pin of the driving chip U5 is respectively connected to the first driving unit and the second driving unit.

[0028] Preferably, the fifth switch unit includes a transistor Q9, a MOS transistor Q10, a voltage regulator Z12, a resistor R29, a resistor R30 and a resistor R32; the base of the transistor Q9 is connected to the control unit, the base of the transistor Q9 is grounded via the resistor R30, the emitter of the transistor Q9 is grounded, the collector of the transistor Q9 is respectively connected to the gate of the MOS transistor Q10, the anode of the voltage regulator Z12 and the first end of the resistor R29 via the resistor R32, the source of the MOS transistor Q10 is respectively connected to the cathode of the voltage regulator Z12, the second end of the resistor R29 and the power supply, and the drain of the MOS transistor Q10 is connected to the power supply pin of the driving chip.

[0029] The present invention also constructs an electronic device, comprising the power supply device as described in any one of the above items.

[0030] A power supply device and electronic equipment implementing the present invention have the following beneficial effects: safe and reliable switching of batteries can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0032] Figure 1 It is a logic block diagram of a power supply device of the present invention;

[0033] Figure 2 It is a partial circuit schematic diagram of an embodiment of a power supply device of the present invention;

[0034] Figure 3 It is a partial circuit schematic diagram of another embodiment of a power supply device of the present invention;

[0035] Figure 4 It is a partial circuit schematic diagram of another embodiment of a power supply device of the present invention. DETAILED DESCRIPTION

[0036] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0037] like Figure 1As shown, in a first embodiment of a power supply device of the present invention, it includes: a first power supply input terminal 110 connectable to a first battery pack, a second power supply input terminal 120 connectable to a second battery pack, a power supply output terminal 600 for providing power output, and a driving power supply unit 500 for outputting a driving power supply voltage; and a control unit 400 configured to output a first control level or a second control level; connecting the control unit 400 and the driving power supply unit 500, and outputting a first driving unit 310 of a first driving level when receiving a first control level; connecting the control unit 400 and the driving power supply unit 500, and outputting a second driving unit 320 of a second driving level when receiving a second control level; connecting the first driving unit 310, the first power supply input terminal 110, and the power supply output terminal 600; The output terminal 600 is used for the first power switch unit 210 to be turned on when receiving the first driving level; the second power switch unit 220 is connected to the second driving unit 320, the second power supply input terminal 120 and the power supply output terminal 600, and is used for the second power switch unit 220 to be turned on when receiving the second driving level; the third driving unit 330 connected to the first power switch unit 210 is used to output the third driving level when the first power switch unit 210 is turned on; the fourth driving unit 340 connected to the second power switch unit 220 is used to output the fourth driving level when the second power switch unit 220 is turned on; the first driving unit 310 is connected to the fourth driving unit 340, and is used to be turned off when receiving the fourth driving level; the second driving unit 320 is connected to the third driving unit 330, and is used to be turned off when receiving the third driving level. Specifically, different battery packs can be connected respectively through the first power supply input terminal 110 and the second power supply input terminal 120. The first power supply input terminal 110 is connected to the first battery pack and connected to the power output terminal 600 through the first power switch unit 210, which provides power output for the power output terminal 600 when the first power switch unit 210 is turned on. The second power supply input terminal 120 is connected to the second battery pack and connected to the power output terminal 600 through the second power switch unit 220, which provides power output for the power output terminal 600 when the second power switch unit 220 is turned on. The control unit 400 is configured to output a first control level or a second control level, and it can be understood that the control unit 400 can select to output the first control level or the second control level according to the status of the first battery pack and the second battery pack. The first driving unit 310 is connected to the control unit 400 and the first power switch unit 210, and when the control unit 400 outputs the first control level, it generates a driving level to drive the first power switch unit 210 to turn on. The second driving unit 320 is connected to the control unit 400 and the second power switch unit 220, and generates a driving level to drive the second power switch unit 220 to conduct when the control unit 400 outputs the second control level. Both the first driving unit 310 and the second driving unit 320 are powered by the driving power supply unit 500.The third driving unit 330 is connected to the first power switch unit 210, and outputs a corresponding driving level according to the on or off state of the first power switch unit 210, and outputs a third driving level when the first power switch unit 210 is on. The second driving unit 320 is connected to the third driving unit 330, and turns off the output when receiving the third driving level. By turning off the output of the second driving unit 320, the second power switch unit 220 is turned off to prevent the current of the power output terminal 600 from being reversed to the second power supply input terminal 120. The fourth driving unit 340 is connected to the second power switch unit 220, and outputs a corresponding driving level according to the on or off state of the second power switch unit 220, and outputs a fourth driving level when the second power switch unit 220 is on. The first driving unit 310 is connected to the fourth driving unit 340, and turns off the output when receiving the fourth driving level. By turning off the output of the first driving unit 310, the first power switch unit 210 is turned off to prevent the current of the power output terminal 600 from being reversed to the first power supply input terminal 110.

[0038] In one embodiment, if Figure 2 As shown, the first power switch unit 210 includes a plurality of first power switch tube groups 211 connected in series with the first power supply input terminal 110, and the series node of any first power switch tube group 211 is connected to the third drive unit 330. Specifically, the first power switch unit 210 can be composed of a plurality of power tube groups connected in series, and each power tube group can include a plurality of power switch tubes, and the plurality of power switch tubes can be connected in parallel or in series, or in combination of series and parallel. Among them, the third drive unit 330 is connected to the series node of any two power tube switch groups connected in series to output a corresponding drive level according to the working state of the power switch group.

[0039] In one embodiment, the first driving unit 310 includes a plurality of first driving switches 311 connected to control ends of the plurality of first power switch tube groups 211; each first driving switch 311 includes: a first triode, a first MOS tube, a first diode, a first voltage regulator tube, a first resistor, a second resistor and a third resistor; the base of the first triode is respectively connected to the anode of the first diode, the first end of the first resistor and the control unit 400, the cathode of the first diode is connected to the fourth driving unit 340, the second end of the first resistor is grounded, the emitter of the first triode is grounded, the collector of the first triode is connected to the gate of the first MOS tube via the second resistor, the source of the first MOS tube is respectively connected to the driving power supply unit 500, the cathode of the first voltage regulator tube and the first end of the third resistor, the anode of the first voltage regulator tube is connected to the second end of the third resistor and then connected to the gate of the first MOS tube, and the drain of the first MOS tube is connected to the control end of the first power switch tube group 211. Specifically, the first driving unit 310 includes a plurality of first driving switches 311. It can be understood that the number of the first driving switches 311 corresponds to the number of the first power switch tube groups 211, that is, each first power switch tube group 211 is driven by a group of first driving switches 311. The first driving switches 311 each include: a first triode, a first diode, a first MOS tube, a first voltage regulator tube, a first resistor, a second resistor and a third resistor; Figure 2 As shown, in a specific first driving switch 311, a transistor Q18, a diode D5, a MOS transistor Q19, a voltage regulator Z5, a resistor R49, a resistor R56 and a resistor R39 are included, wherein the base of the transistor Q18 is respectively connected to the first end of the resistor R49 and the control unit 400 and the anode of the diode D5, the second end of the resistor R49 is grounded, the emitter of the transistor Q18 is grounded, the collector of the transistor Q18 is connected to the gate of the MOS transistor Q19 via the resistor R56, the source of the MOS transistor Q19 is respectively connected to the driving power supply unit 500, the cathode of the voltage regulator Z5 and the first end of the resistor R39, the anode of the voltage regulator Z5 is connected to the second end of the resistor R39 and then connected to the gate of the MOS transistor Q19, and the drain of the MOS transistor Q19 is connected to the control end of the first power switch tube group 211.

[0040] In one embodiment, if Figure 3As shown, the fourth driving unit 340 includes a first switch unit 341 and a second switch unit 342; the first end of the first switch unit 341 is connected to the control unit 400, the second end of the first switch unit 341 is connected to the second power switch unit 220, the third end of the first switch unit 341 is connected to the first end of the second switch unit 342, the second end of the second switch unit 342 is grounded, and the third end of the second switch unit 342 is connected to the cathode of the first diode. Specifically, the fourth driving unit 340 is formed by connecting two-stage switch units, the input end of the first switch unit 341 is connected to the second power switch unit 220, and when the second power switch unit 220 is turned on, there is a voltage input, the control end of the first switch unit 341 is connected to the control unit 400, and it receives the control level of the control unit 400 to turn on or off, when the first switch unit 341 is turned on, there is a voltage output at its output end to the control end of the second switch unit 342, the second switch unit 342 is turned on when receiving the voltage output, and the corresponding output driving level at its output end is the corresponding fourth driving level. On the contrary, when the second power switch unit 220 is turned off, the input end of the first switch unit 341 has no voltage input, the first switch unit 341 is turned off, and its output end has no voltage output. At this time, the control end of the second switch unit 342 has no voltage input and remains in the off state, and its output end correspondingly turns off the output of the fourth driving level. Figure 2 As shown, when the first power switch unit 210 is turned on, when the cathode of the first diode receives the low level corresponding to the fourth drive level, it pulls down the base voltage of the first triode, so that the first triode is in the off state, ensuring the corresponding turn-off of the second drive switch. When the first power switch unit 210 is turned off, when the cathode of the first diode does not receive the fourth drive level, that is, when it corresponds to a high level, it pulls up the base voltage of the first triode. At this time, the control unit 400 can output the second control level to control the first triode to turn on so that the second drive switch is turned on, that is, the second power switch unit 220 is turned on to switch the output connection.

[0041] In a specific embodiment, the first switch unit 341 includes a transistor Q5, a MOS transistor Q1, a voltage regulator Z11, a resistor R19, a resistor R22 and a resistor R27; the base of the transistor Q5 is connected to the control unit 400, the base of the transistor Q5 is grounded via the resistor R22, the emitter of the transistor Q5 is grounded, the collector of the transistor Q5 is respectively connected to the gate of the MOS transistor Q1, the anode of the voltage regulator Z11 and the first end of the resistor R19 via the resistor R27, the source of the MOS transistor Q1 is respectively connected to the cathode of the voltage regulator Z11 The transistor Q5 is connected to the first end of the second power switch unit 342; specifically, the transistor Q5 is turned on after receiving the control level of the control unit 400. When the transistor Q5 is turned on, when the source of the MOS tube Q1 has a voltage input, the gate of the MOS tube Q1 drives the MOS tube Q1 to be turned on due to the voltage division of the resistor R19. After the MOS tube Q1 is turned on, its drain outputs a voltage to the second switch unit 342 to drive the second switch unit 342 to operate.

[0042] In a specific embodiment, the second switch unit 342 includes a MOS transistor Q21, a resistor R116, a resistor R118 and a capacitor C34; the gate of the MOS transistor Q21 is connected to the third end of the first switch unit 341 via the resistor R116, the gate of the MOS transistor Q21 is also grounded via the resistor R118 and the capacitor C34 connected in parallel, the source of the MOS transistor Q21 is grounded, and the drain of the MOS transistor Q21 is connected to the cathode of the first diode. Specifically, when the second power switch unit 220 is turned on, the base of the transistor Q37 receives the output voltage from the first switch unit 341 and then turns on, and its collector voltage is pulled down and outputs a low level. When the second power switch unit 220 is turned off, there is no voltage input to the base of the transistor Q37, the transistor Q37 is in a cut-off state, and the voltage of its collector is the DC power supply voltage, which is a high level. The second drive unit 320 receives a low level to shut down and lock.

[0043] In one embodiment, the second power switch unit 220 includes a plurality of second power switch tube groups 221 connected in series with the second power supply input terminal 120, and the series node of any second power switch tube group 221 is connected to the fourth drive unit 340. Specifically, the second power switch unit 220 may be composed of a plurality of power tube groups connected in series, each power tube group may include a plurality of power switch tubes, and the plurality of power switch tubes may be connected in parallel or in series, or in combination of series and parallel. The fourth drive unit 340 is connected to the series node of any two power tube switch groups connected in series to output a corresponding drive level according to the working state of the power switch group.

[0044] In one embodiment, the second driving unit 320 includes a plurality of second driving switches 321 connected to the control ends of the plurality of second power switch tube groups 221; each second driving switch 321 includes: a second triode, a second MOS tube, a second diode, a second voltage regulator tube, a fourth resistor, a fifth resistor and a sixth resistor; the base of the second triode is respectively connected to the anode of the second diode, the first end of the fourth resistor and the control unit 400, the cathode of the second diode is connected to the third driving unit 330, the second end of the fourth resistor is grounded, the emitter of the second triode is grounded, the collector of the second triode is connected to the gate of the second MOS tube via the fifth resistor, the source of the second MOS tube is respectively connected to the driving power supply unit 500, the cathode of the second voltage regulator tube and the first end of the sixth resistor, the anode of the second voltage regulator tube is connected to the second end of the sixth resistor and then connected to the gate of the second MOS tube, and the drain of the second MOS tube is connected to the control end of the second power switch tube group. Specifically, the second driving unit 320 includes a plurality of second driving switches 321. It can be understood that the number of the second driving switches 321 corresponds to the number of the second power switch tube groups 221, that is, each second power switch tube group 221 is driven by a group of second driving switches. The second driving switches each include: a second triode, a second diode, a second MOS tube, a first voltage regulator tube, a fourth resistor, a fifth resistor and a sixth resistor; Figure 2 As shown, in a specific first driving switch 311, a transistor Q14, a diode D4, a MOS transistor Q15, a voltage regulator Z8, a resistor R41, a resistor R53 and a resistor R38 are included, wherein the base of the transistor Q14 is respectively connected to the first end of the resistor R41 and the control unit 400 and the anode of the diode D4, the second end of the resistor R41 is grounded, the emitter of the transistor Q14 is grounded, the collector of the transistor Q14 is connected to the gate of the MOS transistor Q15 via R53, the source of the MOS transistor Q15 is respectively connected to the driving power supply unit 500, the cathode of the voltage regulator Z8 and the first end of the resistor R38, the anode of the voltage regulator Z8 is connected to the second end of the resistor R38 and then connected to the gate of the MOS transistor Q15, and the drain of the MOS transistor Q15 is connected to the control end of the second power switch tube group 221.

[0045] In one embodiment, the third driving unit 330 includes a third switch unit 331 and a fourth switch unit 332; the first end of the third switch unit 331 is connected to the control unit 400, the second end of the third switch unit 331 is connected to the second power switch unit 220, the third end of the third switch unit 331 is connected to the first end of the fourth switch unit 332, the second end of the fourth switch unit 332 is grounded, and the third end of the fourth switch unit 332 is connected to the cathode of the second diode. Specifically, the third driving unit 330 is formed by connecting two-stage switch units, the input end of the third switch unit 331 is connected to the first power switch unit 210, and when the first power switch unit 210 is turned on, there is a voltage input, the control end of the third switch unit 331 is connected to the control unit 400, and it receives the control level of the control unit 400 to turn on or off, when the third switch unit 331 is turned on, there is a voltage output at its output end to the control end of the fourth switch unit 332, the third switch unit 331 is turned on when receiving the voltage output, and the corresponding output driving level at its output end is the corresponding third driving level. On the contrary, when the first power switch unit 210 is turned off, the input end of the third switch unit 331 has no voltage input, the third switch unit 331 is turned off, and its output end has no voltage output. At this time, the control end of the fourth switch unit 332 has no voltage input and remains in the off state, and its output end correspondingly turns off the output of the third driving level. Figure 2 As shown, when the second power switch unit 220 is turned on, when the cathode of the second diode receives a low level corresponding to the third driving level, it pulls down the base voltage of the second triode, so that the second triode is in the off state, ensuring the corresponding turn-off of the first drive switch 311. When the second power switch unit 220 is turned off, when the cathode of the second diode does not receive the third driving level, that is, when it corresponds to a high level, it pulls up the base voltage of the second triode. At this time, the control unit 400 can output the first control level to control the second triode to turn on so that the first drive switch 311 is turned on, that is, the first power switch unit 210 is turned on to switch the output connection.

[0046] In a specific embodiment, the third switch unit 331 includes a transistor Q3, a MOS transistor Q4, a voltage regulator Z10, a resistor R1, a resistor R13 and a resistor R17; the base of the transistor Q3 is connected to the control unit 400, the base of the transistor Q3 is grounded via the resistor R13, the emitter of the transistor Q3 is grounded, the collector of the transistor Q3 is respectively connected to the gate of the MOS transistor Q4, the anode of the voltage regulator Z10 and the first end of the resistor R1 via the resistor R17, and the source of the MOS transistor Q4 is respectively connected to the cathode of the voltage regulator Z10 , the second end of the resistor R1 and the first power switch unit 210, the drain of the MOS tube Q4 is connected to the first end of the fourth switch unit 332; specifically, the transistor Q3 is turned on after receiving the control level of the control unit 400. When the transistor Q3 is turned on, when there is a voltage input to the source of the MOS tube Q4, the gate of the MOS tube Q4 drives the MOS tube Q4 to be turned on due to the voltage division of the resistor R17. After the MOS tube Q4 is turned on, its drain outputs a voltage to the fourth switch unit 332 to drive the fourth switch unit 332 to operate.

[0047] In a specific embodiment, the fourth switch unit 332 includes a MOS transistor Q17, a resistor R112, a resistor R113 and a capacitor C33; the gate of the MOS transistor Q17 is connected to the third end of the third switch unit 331 via the resistor R112, the gate of the MOS transistor Q17 is also connected to ground via the resistor R113 and the capacitor C33 connected in parallel, the source of the MOS transistor Q17 is grounded, and the drain of the MOS transistor Q17 is connected to the cathode of the second diode. Specifically, when the first power switch unit 210 is turned on, the base of the transistor Q35 receives the output voltage from the third switch unit 331 and then turns on, and its collector voltage is pulled down, and a low level is output. When the first power switch unit 210 is turned off, there is no voltage input to the base of the transistor Q35, the transistor Q35 is in a cut-off state, and the voltage of its collector is the DC power supply voltage, which is a high level. The second drive unit 320 is turned off and locked after receiving a low level.

[0048] like Figure 4As shown, in one embodiment, the driving power supply unit 500 includes a fifth switch unit 510 and a driving chip U5, a first end of the fifth switch unit 510 is connected to the control unit 400, a second end of the fifth switch unit 510 is connected to a power supply, a third end of the fifth switch unit 510 is connected to the power supply pin of the driving chip, a sixth pin and a seventh pin of the driving chip U5 are respectively connected to the control unit 400, and a twelfth pin of the driving chip U5 is respectively connected to the first driving unit 310 and the second driving unit 320. Specifically, the control unit 400 outputs a control signal to drive the fifth switch unit 510 to turn on or off, so as to power on the driving chip so that the driving chip is powered on and works, and outputs a driving power supply when receiving a signal from the control unit 400, so that the first driving unit 310 and the second driving unit 320 output corresponding driving levels when receiving the control signal.

[0049] Optionally, the fifth switch unit 510 includes a transistor Q9, a MOS transistor Q10, a voltage regulator Z12, a resistor R29, a resistor R30, and a resistor R32; the base of the transistor Q9 is connected to the control unit 400, the base of the transistor Q9 is grounded via the resistor R30, the emitter of the transistor Q9 is grounded, the collector of the transistor Q9 is respectively connected to the gate of the MOS transistor Q10, the anode of the voltage regulator Z12, and the first end of the resistor R29 via the resistor R32, the source of the MOS transistor Q10 is respectively connected to the cathode of the voltage regulator Z12, the second end of the resistor R29, and the power supply, and the drain of the MOS transistor Q10 is connected to the power supply pin of the driving chip. Specifically, the fifth switch unit 510 is turned on or off when receiving the control level of the control unit through the cascade switch formed by the transistor Q9 and the MOS transistor Q10.

[0050] In addition, an electronic device of the present invention includes a power supply device as described above, and the power supply device is used to connect a battery pack and a working circuit to realize power supply to the working circuit.

[0051] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, the above technical features can be freely combined without departing from the concept of the present invention, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the coverage of the claims of the present invention.

Claims

1. A power supply device, It is characterized in that include: A first power supply input terminal connectable to the first battery pack, a second power supply input terminal connectable to the second battery pack, a power supply output terminal for providing power output, and a driving power supply unit for outputting a driving power supply voltage; as well as a control unit configured to output a first control level or a second control level; a first driving unit connected to the control unit and the driving power supply unit and configured to output a first driving level when receiving the first control level; a second driving unit connected to the control unit and the driving power supply unit and configured to output a second driving level when receiving the second control level; A first power switch unit connected to the first driving unit, the first power supply input terminal and the power supply output terminal, and configured to be turned on when receiving the first driving level; A second power switch unit connected to the second driving unit, the second power supply input terminal and the power supply output terminal, configured to be turned on when receiving the second driving level; a third driving unit connected to the first power switch unit and configured to output a third driving level when the first power switch unit is turned on; a fourth driving unit connected to the second power switch unit and configured to output a fourth driving level when the second power switch unit is turned on; The first driving unit is connected to the fourth driving unit and is configured to be turned off when receiving the fourth driving level; The second driving unit is connected to the third driving unit and is configured to be turned off when receiving the third driving level.

2. The power supply device according to claim 1, It is characterized in that The first power switch unit includes a plurality of first power switch tube groups connected in series with the first power supply input terminal, and a series node of any of the first power switch tube groups is connected to the third driving unit.

3. The power supply device according to claim 2, It is characterized in that The first driving unit includes a plurality of first driving switches correspondingly connected to the control ends of the plurality of first power switch tube groups; Each of the first driving switches includes: a first triode, a first MOS transistor, a first diode, a first voltage regulator tube, a first resistor, a second resistor and a third resistor; The base of the first triode is respectively connected to the anode of the first diode, the first end of the first resistor and the control unit, the cathode of the first diode is connected to the fourth driving unit, the second end of the first resistor is grounded, the emitter of the first triode is grounded, the collector of the first triode is connected to the gate of the first MOS tube via the second resistor, the source of the first MOS tube is respectively connected to the driving power supply unit, the cathode of the first voltage regulator tube and the first end of the third resistor, the anode of the first voltage regulator tube and the second end of the third resistor are connected to the gate of the first MOS tube, and the drain of the first MOS tube is connected to the control end of the first power switch tube group.

4. The power supply device according to claim 3, It is characterized in that The fourth driving unit includes a first switch unit and a second switch unit; the first end of the first switch unit is connected to the control unit, the second end of the first switch unit is connected to the second power switch unit, the third end of the first switch unit is connected to the first end of the second switch unit, the second end of the second switch unit is grounded, and the third end of the second switch unit is connected to the cathode of the first diode.

5. The power supply device according to claim 4, It is characterized in that The first switch unit includes a transistor Q5, a MOS transistor Q1, a voltage regulator Z11, a resistor R19, a resistor R22 and a resistor R27; the base of the transistor Q5 is connected to the control unit, the base of the transistor Q5 is grounded via the resistor R22, the emitter of the transistor Q5 is grounded, the collector of the transistor Q5 is respectively connected to the gate of the MOS transistor Q1, the anode of the voltage regulator Z11 and the first end of the resistor R19 via the resistor R27, the source of the MOS transistor Q1 is respectively connected to the cathode of the voltage regulator Z11, the second end of the resistor R19 and the second power switch unit, and the drain of the MOS transistor Q1 is connected to the first end of the second switch unit; and / or The second switch unit includes a MOS tube Q21, a resistor R116, a resistor R118 and a capacitor C34; the gate of the MOS tube Q21 is connected to the third end of the first switch unit via the resistor R116, the gate of the MOS tube Q21 is also grounded via the resistor R118 and the capacitor C34 connected in parallel, the source of the MOS tube Q21 is grounded, and the drain of the MOS tube Q21 is connected to the cathode of the first diode.

6. The power supply device according to claim 1, It is characterized in that The second power switch unit includes a plurality of second power switch tube groups connected in series with the second power supply input terminal, and a series node of any second power switch tube group is connected to the fourth driving unit.

7. The power supply device according to claim 6, It is characterized in that The second driving unit includes a plurality of second driving switches correspondingly connected to the control ends of the plurality of second power switch tube groups; Each of the second driving switches includes: a second triode, a second MOS tube, a second diode, a second voltage regulator tube, a fourth resistor, a fifth resistor and a sixth resistor; The base of the second triode is respectively connected to the anode of the second diode, the first end of the fourth resistor and the control unit, the cathode of the second diode is connected to the third driving unit, the second end of the fourth resistor is grounded, the emitter of the second triode is grounded, the collector of the second triode is connected to the gate of the second MOS tube via the fifth resistor, the source of the second MOS tube is respectively connected to the driving power supply unit, the cathode of the second voltage regulator tube and the first end of the sixth resistor, the anode of the second voltage regulator tube is connected to the second end of the sixth resistor and then connected to the gate of the second MOS tube, and the drain of the second MOS tube is connected to the control end of the second power switch tube group.

8. The power supply device according to claim 7, It is characterized in that The third driving unit includes a third switch unit and a fourth switch unit; a first end of the third switch unit is connected to the control unit, a second end of the third switch unit is connected to the second power switch unit, a third end of the third switch unit is connected to the first end of the fourth switch unit, a second end of the fourth switch unit is grounded, and a third end of the fourth switch unit is connected to the cathode of the second diode.

9. The power supply device according to claim 8, It is characterized in that The third switch unit includes a transistor Q3, a MOS transistor Q4, a voltage regulator Z10, a resistor R1, a resistor R13 and a resistor R17; the base of the transistor Q3 is connected to the control unit, the base of the transistor Q3 is grounded via the resistor R13, the emitter of the transistor Q3 is grounded, the collector of the transistor Q3 is respectively connected to the gate of the MOS transistor Q4, the anode of the voltage regulator Z10 and the first end of the resistor R1 via the resistor R17, the source of the MOS transistor Q4 is respectively connected to the cathode of the voltage regulator Z10, the second end of the resistor R1 and the first power switch unit, and the drain of the MOS transistor Q4 is connected to the first end of the fourth switch unit; and / or The fourth switch unit includes a MOS tube Q17, a resistor R112, a resistor R113 and a capacitor C33; the gate of the MOS tube Q17 is connected to the third end of the third switch unit via the resistor R112, the gate of the MOS tube Q17 is also grounded via the resistor R113 and the capacitor C33 connected in parallel, the source of the MOS tube Q17 is grounded, and the drain of the MOS tube Q17 is connected to the cathode of the second diode.

10. The power supply device according to claim 1, It is characterized in that The driving power supply unit includes a fifth switch unit and a driving chip U5. The first end of the fifth switch unit is connected to the control unit, the second end of the fifth switch unit is connected to a power supply, the third end of the fifth switch unit is connected to the power supply pin of the driving chip U5, the sixth pin and the seventh pin of the driving chip U5 are respectively connected to the control unit, and the twelfth pin of the driving chip U5 is respectively connected to the first driving unit and the second driving unit.

11. The power supply device according to claim 10, It is characterized in that The fifth switch unit includes a transistor Q9, a MOS transistor Q10, a voltage regulator Z12, a resistor R29, a resistor R30 and a resistor R32; the base of the transistor Q9 is connected to the control unit, the base of the transistor Q9 is grounded via the resistor R30, the emitter of the transistor Q9 is grounded, the collector of the transistor Q9 is respectively connected to the gate of the MOS transistor Q10, the anode of the voltage regulator Z12 and the first end of the resistor R29 via the resistor R32, the source of the MOS transistor Q10 is respectively connected to the cathode of the voltage regulator Z12, the second end of the resistor R29 and the power supply, and the drain of the MOS transistor Q10 is connected to the power supply pin of the driving chip U5.

12. An electronic device, It is characterized in that Comprising the power supply device according to any one of claims 1 to 11.

Images