CN203151458U - Switch driving circuit - Google Patents
Switch driving circuit Download PDFInfo
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- CN203151458U CN203151458U CN 201320009561 CN201320009561U CN203151458U CN 203151458 U CN203151458 U CN 203151458U CN 201320009561 CN201320009561 CN 201320009561 CN 201320009561 U CN201320009561 U CN 201320009561U CN 203151458 U CN203151458 U CN 203151458U
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- switch
- switching tube
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- driving
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Abstract
The utility model discloses a switch driving circuit which comprises a driving power supply, a driving buffer unit, a feed switch unit, a unidirectionally-conducted driving current-limiting unit and a unidirectionally-conducted clamping switch unit. The driving power supply is connected with the driving buffer unit and the feed switch unit; the unidirectionally-conducted driving current-limiting unit is connected with the driving buffer unit, the feed switch unit and the unidirectionally-conducted clamping switch unit; the unidirectionally-conducted driving current-limiting unit outputs driving voltage and driving current which are used for driving a controlled main switching tube; and the driving voltage and the driving current of the controlled main switching tube are cut off through the unidirectionally-conducted clamping switch unit. Though the method, the problems such as switch control failure can be solved, and the stability and the reliability of a switching circuit are ensured.
Description
Technical field
The utility model relates to the battery management field, particularly relates to a kind of switch driving circuit.
Background technology
Switch driving circuit is applied to multiple electronic product, especially battery and similar battery class is needed the energy storage product of electronic circuit.For example, lithium-ions battery management system, lithium polymer battery battery management system, lead accumulator, nickel-cadmium cell, Ni-MH battery, super capacitor, and the peripheral electron circuit of following novel energy-storing product.
In the prior art, as shown in Figure 1, under control circuit the electricity or do not power on, the open circuit voltage of charger and the voltage difference of battery pack are during greater than certain value, the potential reference earth potential CH-of the first driving power VCC1 and the second driving power VCC2 and control signal COP1 is high level, thereby transistor Q11 this moment turn-offs transistor Q12 and turn-offs, and Q13 is in conducting state always thereby the grid of metal-oxide-semiconductor Q13 and the voltage between the source electrode are high level driven MOS pipe.At this moment charger will charge to battery pack always, have great potential safety hazard.When control signal COP1 is low level, when metal-oxide-semiconductor Q13 turn-offs, because transistor Q11 conducting and transistor Q12 conducting, the first driving power VCC1 forms the loop by resistance R 15, resistance R 13 and produces electric current, the 2nd VCC2 forms the loop by resistance R 12, transistor Q12 and produces electric current simultaneously, therefore causes bigger kwh loss.
This shows, the problem that existing switch driving circuit lost efficacy to switch control meeting appearance, stability and the reliability of switching circuit are relatively poor.
The utility model content
The technical problem that the utility model mainly solves provides a kind of switch driving circuit, can solve problems such as switch control inefficacy, has guaranteed stability and the reliability of switching circuit.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of switch driving circuit is provided, is used for driving a controlled main switch, comprising:
Driving power is used for providing operating voltage VCC;
Drive buffer cell, be used for receiving the external drive signal to realize power amplification and level translation;
The feeding switch unit is connected with driving power and driving buffer cell, drives conducting or the shutoff of buffer cell control feeding switch unit, in order to provide or to cut off driving voltage and electric current;
The driving current limliting unit of unidirectional conducting is connected between feeding switch unit and the controlled main switch;
The clamp switch unit of unidirectional conducting is connected in parallel between the control end and ground of controlled main switch, is connected with the driving buffer cell, and is controlled by the driving buffer cell;
Wherein, drive buffer cell and comprise resistance R 1, resistance R 6 and first switching tube; First end of resistance R 1 is connected in operating voltage VCC, and second end of resistance R 1 is connected in second end of first switching tube, and the external drive signal inputs to first end of first switching tube, the 3rd end ground connection of first switching tube by resistance R 6.
Wherein, the feeding switch unit comprises the second switch pipe, and first end of second switch pipe is connected between second end of second end of resistance R 1 and first switching tube, and the 3rd end of second switch pipe is connected between first end of operating voltage VCC and resistance R 1.
Wherein, the driving current limliting unit of unidirectional conducting comprises diode D1, resistance R 2, resistance R 5, the 3rd switching tube and the 4th switching tube, the anode of diode D1 is connected in second end of second switch pipe, the negative terminal of diode D1 is connected in first end of resistance R 2, second end of resistance R 2 is connected in second end of the 3rd switching tube, first end of the 3rd switching tube is connected between first end of second end of first switching tube and second switch pipe, and be connected with second end of resistance R 1, first end of resistance R 5 is connected between second end of second end of the 3rd switching tube and resistance R 2, second end of resistance R 5 is connected in first end of the 4th switching tube, and the 3rd end of the 4th switching tube is connected with controlled main switch.
Wherein, the clamp switch unit of unidirectional conducting comprises diode D2 and resistance R 4, first end of resistance R 4 is connected between the anode of second end of second switch pipe and diode D1, second end of resistance R 4 is connected in the anode of diode D2, and the negative terminal of diode D2 is connected in second end of the 4th switching tube.
First end of controlled main switch is connected between second end of the negative terminal of diode D2 and the 4th switching tube, and the 3rd end of controlled main switch is connected in the 3rd end of the 4th switching tube.
Switch driving circuit further comprises resistance R 3, first end of resistance R 3 is connected between second end of the negative terminal of diode D2 and the 4th switching tube, and be connected with first end of controlled main switch, second end of resistance R 3 is connected between the 3rd end of the 3rd end of the 4th switching tube and controlled main switch.
Wherein, first switching tube and the 3rd switching tube are NMOS pipe or NPN triode; Second switch Guan Yudi four switching tubes are PMOS pipe or PNP triode.
The beneficial effects of the utility model are: the situation that is different from prior art, the clamp switch unit of the utility model by driving buffer cell, unidirectional conducting and the break-make of the controlled main switch of feeding switch unit controls of unidirectional conducting, can solve problems such as switch control inefficacy, guarantee stability and the reliability of switching circuit.
Description of drawings
Fig. 1 is switch driving circuit schematic diagram in the prior art;
Fig. 2 is the switch driving circuit schematic diagram of the utility model embodiment.
Embodiment
Consult Fig. 2, Fig. 2 is the switch driving circuit schematic diagram of the utility model embodiment.The switch driving circuit that present embodiment discloses is used for driving a controlled main switch M1, comprising: driving power 21, driving buffer cell 22, driving current limliting unit 23, feeding switch unit 24 and clamp switch unit 25.
Drive current limliting unit 23 unidirectional conductings, and be connected between feeding switch unit 24 and the controlled main switch M1.In the present embodiment, drive current limliting unit 23 and comprise diode D1, resistance R 2, resistance R 5, the 3rd switching tube Q3 and the 4th switching tube Q4.The anode of diode D1 is connected in second end 32 of second switch pipe Q2, and the negative terminal of diode D1 is connected in first end 41 of resistance R 2.Second end 42 of resistance R 2 is connected in second end 52 of the 3rd switching tube Q3.First end 51 of the 3rd switching tube Q3 is connected between first end 31 of second end 22 of the first switching tube Q1 and second switch pipe Q2, and is connected with second end 12 of resistance R 1.The 3rd end 53 ground connection of the 3rd switching tube Q3.First end 61 of resistance R 5 is connected between second end 42 of second end 52 of the 3rd switching tube Q3 and resistance R 2, and the 3rd end 73 that second end 62 of resistance R 5 is connected in first end, 71, the four switching tube Q4 of the 4th switching tube Q4 is connected with controlled main switch M1.Wherein, first end 51 of the 3rd switching tube Q3, be its grid, second end 52 of the 3rd switching tube Q3 is its drain electrode, the 3rd end 53 of the 3rd switching tube Q3 is its source electrode, and first end 71 of the 4th switching tube Q4 is its base stage, second end 72 of the 4th switching tube Q4 is its emitter, and the 3rd end 73 of the 4th switching tube Q4 is its collector electrode.
The 25 unidirectional conductings of clamp switch unit are connected in parallel between the control end 91 and ground of controlled main switch M1, are connected with driving buffer cell 22, and are controlled by driving buffer cell 22.In the present embodiment, clamp switch unit 25 comprises diode D2 and resistance R 4.First end 81 of resistance R 4 is connected between the anode of second end 32 of second switch pipe Q2 and diode D1, and second end 82 of resistance R 4 is connected in the anode of diode D2, and the negative terminal of diode D2 is connected in second end 72 of the 4th switching tube Q4.
In the present embodiment, first end 91 of controlled main switch M1 is connected between second end 72 of the negative terminal of diode D2 and the 4th switching tube Q4, the 3rd end 93 of controlled main switch M1 is connected in the 3rd end 73 of the 4th switching tube Q4, wherein, first end 91 of controlled main switch M1 is its grid, second end 92 of controlled main switch M1 is its drain electrode, and the 3rd end 93 of controlled main switch M1 is its source electrode.
In the present embodiment, switch driving circuit further comprises resistance R 3.First end of resistance R 3 is connected between second end of the negative terminal of diode D2 and the 4th switching tube Q4, and be connected with first end of controlled main switch M1, second end of resistance R 3 is connected between the 3rd end of the 3rd end of the 4th switching tube Q4 and controlled main switch M1.
Below describe the operation principle of switch driving circuit in detail:
When electricity under the control circuit or when not powering on, the external drive signal is low level, the first switching tube Q1 turn-offs, thereby second switch pipe Q2 and the 3rd switching tube Q3 are turn-offed.Voltage between the 3rd end 73 of the 4th switching tube Q4 and first end 71 of the 4th switching tube Q4 is low level, and the 4th switching tube Q4 turn-offs, and it is many that the open circuit voltage of charger surpasses battery voltage.To be much higher than charger negative terminal CH-current potential with reference to ground B-current potential this moment, but because the unidirectional conducting effect of diode D1, the voltage of B-current potential can not arrive first end 91 of controlled main switch M1, and resistance R 3 is pulled down to the CH-current potential with first end, 91 current potentials of controlled main switch M1, make the voltage between the 3rd end of first end of controlled main switch M1 and controlled main switch M1 reduce to low level, thereby make controlled main switch M1 keep off state, charge circuit disconnects.Therefore, this kind design has solved because the problems such as switch control inefficacy that the voltage difference of the open circuit voltage of charger and battery pack is brought during greater than certain value, thus the reliability of assurance switching circuit.
After control circuit powered up, driving power 21 was high level always.If the external drive signal is for being high level, the then first switching tube Q1, second switch pipe Q2 conducting, the 3rd switching tube Q3, the 4th switching tube Q4 shutoff.Owing to be higher than the CH-current potential with reference to ground B-current potential, the potential reference CH-current potential that VCC voltage process resistance R 4 and diode D2 are input to controlled main switch M1 first end 91 is high level, thus controlled main switch M1 conducting, the charge circuit conducting.If the external drive signal is for being low level, the first switching tube Q1, second switch pipe Q2 turn-offs, first end, 51 current potentials of the 3rd switching tube Q3 approximate the VCC current potential, the 3rd switching tube Q3 conducting, the 4th switching tube Q4 conducting, junction capacitance charge stored between controlled main switch M1 first end 91 and controlled main switch M1 the 3rd end discharges fast by the 4th switching tube Q4, thereby making voltage between controlled main switch M1 first end 91 and controlled main switch M1 the 3rd end be lower than its turn-on threshold voltage makes controlled main switch M1 turn-off fast, charge circuit disconnects, thereby has solved the problem that has kwh loss because of controlled main switch M1 after closing.
In the present embodiment, the first switching tube Q1 and the 3rd switching tube Q3 are NMOS pipe or NPN triode, and second switch pipe Q2 and the 4th switching tube Q4 are PMOS pipe or PNP triode.
Generally speaking, the switch driving circuit of present embodiment is by driving driving voltage and the electric current that 23 outputs of current limliting unit are used for driving controlled main switch M1.When the external drive signal is low level, drive buffer cell 22 output high level, feeding switch unit 24 turn-offs, clamp switch unit 25 is high-impedance state, drive current limliting unit 23 conductings, therefore the driving voltage and the electric current that namely cut off controlled main switch M1 can solve problems such as controlled main switch M1 control inefficacy, guarantee stability and the reliability of switching circuit, and further solved the problem that has kwh loss because of controlled main switch M1 after closing.
In sum, conducting feed element 24 was turn-offed simultaneously and is driven current limliting unit 23 when switch driving circuit of the present utility model charged, driving power 21 is through the controlled main switch M1 of clamp switch unit 25 controls conducting, and following electricity or drive the current limliting unit controlled main switch M1 of 23 controls when not powering on and turn-off, controlled main switch M1 junction capacitance charge stored discharges fast by driving current limliting unit 23, thereby solved problems such as switch control inefficacy, guaranteed stability and the reliability of switching circuit.
The above only is embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.
Claims (7)
1. a switch driving circuit is used for driving a controlled main switch, it is characterized in that described switch driving circuit comprises:
Driving power is used for providing operating voltage VCC;
Drive buffer cell, be used for receiving the external drive signal to realize power amplification and level translation;
The feeding switch unit is connected with described driving power and described driving buffer cell, and described driving buffer cell is controlled conducting or the shutoff of described feeding switch unit, in order to provide or to cut off driving voltage and electric current;
The driving current limliting unit of unidirectional conducting is connected between described feeding switch unit and the described controlled main switch;
The clamp switch unit of unidirectional conducting is connected in parallel between the control end and ground of described controlled main switch, and the clamp switch unit of described unidirectional conducting is connected with described driving buffer cell, and is controlled by described driving buffer cell;
Wherein, described switch driving circuit is used for driving driving voltage and the electric current of described controlled main switch by the driving current limliting unit output of described unidirectional conducting; Cut off driving voltage and the electric current of described controlled main switch by the clamp switch unit of described unidirectional conducting.
2. according to the described switch driving circuit of claim 1, it is characterized in that described driving buffer cell comprises resistance R 1, resistance R 6 and first switching tube; Wherein, first end of described resistance R 1 is connected in described operating voltage VCC, second end of described resistance R 1 is connected in second end of described first switching tube, and described external drive signal inputs to first end of described first switching tube, the 3rd end ground connection of described first switching tube by described resistance R 6.
3. according to the described switch driving circuit of claim 2, it is characterized in that, described feeding switch unit comprises the second switch pipe, first end of described second switch pipe is connected between second end of second end of described resistance R 1 and described first switching tube, and the 3rd end of described second switch pipe is connected between first end of described operating voltage VCC and described resistance R 1.
4. according to the described switch driving circuit of claim 3, it is characterized in that the driving current limliting unit of described unidirectional conducting comprises diode D1, resistance R 2, resistance R 5, the 3rd switching tube and the 4th switching tube, wherein:
The anode of described diode D1 is connected in second end of described second switch pipe, and the negative terminal of described diode D1 is connected in first end of described resistance R 2;
Second end of described resistance R 2 is connected in second end of described the 3rd switching tube, and first end of described the 3rd switching tube is connected between first end of second end of described first switching tube and described second switch pipe, and is connected with second end of described resistance R 1;
First end of described resistance R 5 is connected between second end of second end of described the 3rd switching tube and described resistance R 2, second end of described resistance R 5 is connected in first end of described the 4th switching tube, and the 3rd end of described the 4th switching tube is connected with described controlled main switch.
5. according to the described switch driving circuit of claim 4, it is characterized in that, the clamp switch unit of described unidirectional conducting comprises diode D2 and resistance R 4, wherein, first end of described resistance R 4 is connected between the anode of second end of described second switch pipe and described diode D1, second end of described resistance R 4 is connected in the anode of described diode D2, and the negative terminal of described diode D2 is connected in second end of described the 4th switching tube.
6. according to the described switch driving circuit of claim 5, it is characterized in that, first end of described controlled main switch is connected between second end of the negative terminal of described diode D2 and the 4th switching tube, and the 3rd end of described controlled main switch is connected in the 3rd end of described the 4th switching tube;
Described switch driving circuit further comprises resistance R 3, first end of described resistance R 3 is connected between second end of the negative terminal of described diode D2 and the 4th switching tube, and be connected with first end of described controlled main switch, second end of described resistance R 3 is connected between the 3rd end of the 3rd end of described the 4th switching tube and described controlled main switch.
7. according to the described switch driving circuit of claim 4, it is characterized in that described first switching tube and described the 3rd switching tube are NMOS pipe or NPN triode; Described second switch pipe and described the 4th switching tube are PMOS pipe or PNP triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320009561 CN203151458U (en) | 2013-01-08 | 2013-01-08 | Switch driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320009561 CN203151458U (en) | 2013-01-08 | 2013-01-08 | Switch driving circuit |
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| Publication Number | Publication Date |
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| CN203151458U true CN203151458U (en) | 2013-08-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320009561 Expired - Lifetime CN203151458U (en) | 2013-01-08 | 2013-01-08 | Switch driving circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103916114B (en) * | 2013-01-08 | 2017-02-08 | 东莞钜威动力技术有限公司 | Switch driving circuit |
-
2013
- 2013-01-08 CN CN 201320009561 patent/CN203151458U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103916114B (en) * | 2013-01-08 | 2017-02-08 | 东莞钜威动力技术有限公司 | Switch driving circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160324 Address after: 523808, Guangdong District, Songshan hi tech Industrial Development Zone, Dongguan, seven industrial North Road, 1 force science and technology center, 3 floor, B District Patentee after: Dongguan Powerwise Technology Co., Ltd. Address before: 523808 productivity building, Songshan science and Technology Industrial Park, Guangdong, Dongguan Province, room 401-403 Patentee before: Dongguan PowerWise New Energy Co., Ltd. |