CN216437067U - Drive circuit and auxiliary power supply of push-pull boosting device - Google Patents
Drive circuit and auxiliary power supply of push-pull boosting device Download PDFInfo
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- CN216437067U CN216437067U CN202122409126.2U CN202122409126U CN216437067U CN 216437067 U CN216437067 U CN 216437067U CN 202122409126 U CN202122409126 U CN 202122409126U CN 216437067 U CN216437067 U CN 216437067U
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Abstract
The utility model provides a drive circuit and an auxiliary power supply of a push-pull boosting device, wherein the drive circuit comprises a first drive branch circuit, and a first drive signal input by a drive chip is converted into pulse drive current for driving a first group of power switch devices in the push-pull boosting device by the first drive branch circuit and is output; the first driving branch comprises a first input end, a first output end, a first switching tube, a second switching tube and two first balance resistors; the first switch tube and the second switch tube are connected between a voltage source and a reference ground in series, the first output end is electrically connected with a connection point of the first switch tube and the second switch tube, and the control ends of the first switch tube and the second switch tube are electrically connected with the first input end through a first balance resistor respectively. The utility model discloses can greatly reduce drive circuit's cost, guarantee the stability of drive circuit work simultaneously.
Description
Technical Field
The utility model relates to an electronic drive field, more specifically say, relate to a push-pull booster's drive circuit and auxiliary power supply.
Background
In order to reduce the dynamic loss of the power switch device, the power semiconductor device needs to be switched rapidly, which requires that the driving circuit has a strong load capacity and can provide a large pulse current, especially for a plurality of power switch devices connected in parallel.
In order to obtain the maximum parallel current sharing, the same driving source needs to be used for each switching power semiconductor device, which requires whether the driving circuit can output larger pulse current. At present, in order to obtain a large pulse driving current to realize reliable high-speed driving, a special PWM driving chip is used, and a pulse current sufficient for driving the switching power semiconductor device is directly output through the PWM driving chip. The cost of the PWM driving chip is relatively high.
In addition, there is a scheme of realizing pulse current output by a push-pull driving circuit, but in these circuits, the switching device is affected by external temperature to cause variation of relevant parameters, thereby causing poor reliability and stability of the circuit.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in that, to the problem that the pulse current that above-mentioned PWM driver chip cost is higher, push-pull drive mode produced easily receives ambient temperature influence, provide a push-pull booster unit's drive circuit and auxiliary power supply.
The technical solution to solve the above technical problem is to provide a driving circuit of a push-pull boosting device, which includes a first driving branch, and the first driving branch converts a first driving signal input by a driving chip into a pulse driving current for driving a first set of power switch devices in the push-pull boosting device and outputs the pulse driving current;
the first driving branch comprises a first input end, a first output end, a first switching tube, a second switching tube and two first balance resistors, the conduction conditions of the first switching tube and the second switching tube are opposite, the first input end forms the input end of the first driving branch, and the first output end forms the output end of the first driving branch; first switch tube and second switch tube series connection are between voltage source and reference ground, first output with the tie point electric connection of first switch tube and second switch tube, just the control end of first switch tube and second switch tube respectively through a first balancing resistance with first input electric connection, and by two first balancing resistance makes respectively the voltage of the control end of first switch tube and second switch tube keeps stable under different ambient temperature.
As a further improvement of the present invention, the first switch tube is composed of a first NPN type triode, the second switch tube is composed of a first PNP type triode, wherein: the first NPN type triode is connected between a voltage source and a first output end in series through a collector and an emitter; the first PNP type triode is connected between the first output end and the reference ground in series through an emitter and a collector.
As a further improvement, the first driving branch further includes a first isolation resistor, the resistance of the first isolation resistor is greater than one hundred times of the resistance of the first balance resistor, and the first input is connected to the reference ground via the first isolation resistor.
As a further improvement of the present invention, the first balance resistor has a resistance value between 10 Ω and 50 Ω.
As a further improvement, the driving circuit further includes a filter capacitor, the filter capacitor is electrically connected to the collector of the first NPN type triode.
As a further improvement of the present invention, the driving circuit includes a second driving branch, and the second driving branch converts a second driving signal from the driving chip into a pulse driving current for driving a second group of power switching devices in the push-pull boosting device, and the second driving signal and the first driving signal are complementary;
the second driving branch comprises a second input end, a second output end, a third switching tube, a fourth switching tube and two second balance resistors, the conduction conditions of the third switching tube and the fourth switching tube are opposite, the second input end forms the input end of the second driving branch, and the second output end forms the output end of the second driving branch; the third switch tube and the fourth switch tube are connected in series between a voltage source and a reference ground, the second output end is electrically connected with a connection point of the third switch tube and the fourth switch tube, the control ends of the third switch tube and the fourth switch tube are respectively electrically connected with the second input end through a second balance resistor, and the two second balance resistors respectively enable the voltages of the control ends of the third switch tube and the fourth switch tube to be kept stable at different environmental temperatures.
As a further improvement of the present invention, the third switch tube is composed of a second NPN type triode, and the fourth switch tube is composed of a second PNP type triode, wherein: the second NPN type triode is connected between a voltage source and a second output end in series through a collector and an emitter; the second PNP type triode is connected between the second output end and the reference ground in series through an emitter and a collector.
As a further improvement, the second driving branch further comprises a second isolation resistor, the resistance of the second isolation resistor is greater than one hundred times of the resistance of the second balance resistor, and the second input is connected to the reference ground via the second isolation resistor.
As a further improvement of the utility model, the resistance value of the second balance resistor is between 10 and 50 omega.
The utility model also provides an auxiliary power supply for the power supply of back-stage SPWM drive plate, auxiliary power supply includes driver chip, push-pull booster unit and as above push-pull booster unit's drive circuit.
The utility model discloses following beneficial effect has: the first switching tube and the second switching tube which are connected in series convert a first driving signal input by a driving chip into pulse driving current so as to drive a power switch device in the push-pull booster, and meanwhile, the first balance resistor is added to the first switching tube and the second switching tube, so that the instability of the control end voltage caused by the parameter change (generated by the temperature change under the extreme environment) of the first switching tube and the second switching tube can be avoided.
Drawings
Fig. 1 is a circuit topology diagram of a driving circuit of a push-pull boost device according to an embodiment of the present invention;
fig. 2 is a circuit topology diagram of a driving circuit of a push-pull boost device according to another embodiment of the present invention;
fig. 3 is a circuit topology diagram of an auxiliary power supply according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the present invention is a circuit topology diagram of a driving circuit of a push-pull voltage boosting apparatus, and the driving circuit can be applied to driving control of a power switch in the push-pull voltage boosting apparatus (e.g., a push-pull voltage boosting apparatus in an energy storage power supply). The driving circuit of the push-pull boosting device of the embodiment includes a first driving branch, and the first driving branch converts a first driving signal input by a driving chip into a pulse driving current for driving a first group of power switching devices in the push-pull boosting device and outputs the pulse driving current, that is, the first driving signal is subjected to power amplification, so that the push-pull boosting device can generate a corresponding output signal.
The first driving branch comprises a first input end IN1, a first output end OUT1, a first switch tube Q1, a second switch tube Q2 and two first balance resistors R1 and R2, the conduction conditions of the first switch tube R1 and the second switch tube R2 are opposite (i.e. when the first switch tube Q1 is conducted when the control end voltage is high level, the second switch tube Q2 is conducted when the control end voltage is low level, when the first switch tube Q1 is conducted when the control end voltage is low level, the second switch tube Q2 is conducted when the control end voltage is high level), and constitutes an input of the first drive branch by a first input IN1, and an output of the first drive branch by a first output OUT1, namely the first driving branch receives the first driving signal from the driver chip through the first input terminal IN1, and outputting the pulsed drive current to a first set of power switching devices in the push-pull boost device through a first output terminal OUT 1.
The first switch tube Q1 and the second switch tube Q2 are connected IN series between a voltage source Vcc and a ground GND, the first output end OUT1 is electrically connected to a connection point of the first switch tube Q1 and the second switch tube Q2, control ends of the first switch tube Q1 and the second switch tube Q2 are electrically connected to the first input end IN1 through a first balancing resistor R1/R2, and voltages of the control ends of the first switch tube Q1 and the second switch tube Q2 are kept stable at different environmental temperatures by two first balancing resistors R1 and R2.
The driving circuit of the push-pull boosting device converts a first driving signal input by the driving chip into pulse driving current through the first switching tube Q1 and the second switching tube Q2 which are connected between a voltage source Vcc and a reference ground in series so as to drive a power switching device in the push-pull boosting device, and compared with a special high-power driving chip, the cost can be greatly reduced. Meanwhile, by adding the first balance resistors R1 and R2 to the control terminals of the first switching tube Q1 and the second switching tube Q2, the instability of the control terminal voltage caused by parameter changes (generated by temperature changes in extreme environments) of the first switching tube Q1 and the second switching tube Q2 can be avoided, and the stability of the driving circuit can be greatly improved.
In an embodiment of the present invention, the first switch tube Q1 is composed of a first NPN type triode, and the second switch tube Q2 is composed of a first PNP type triode, wherein: the first NPN type triode is connected between a voltage source Vcc and a first output end OUT1 in series through a collector and an emitter; the first PNP transistor is connected in series between the first output terminal OUT1 and the ground GND via the emitter and the collector.
In this way, when the first NPN transistor is affected by the external temperature to cause the relevant parameter to change, for example, when the temperature rises in an extreme environment, the collector current Ic increases, the emitter current Ie also increases accordingly, so that the voltage drop of the first balancing resistor R1 also increases, according to the formula: vbe is Vb-Ie × Re (where Vbe is the voltage between the base and the emitter, Vb is the base voltage, and Re is the external emitter resistance), the base voltage Vb is substantially maintained due to the presence of the first balancing resistor R1, and finally the collector current Ic is substantially balanced and unchanged, thereby ensuring stable operation of the entire driving circuit.
IN an embodiment of the present invention, the first driving branch further includes a first isolation resistor R3, a resistance of the first isolation resistor R3 is greater than one hundred times a resistance of the first balance resistor R1/R2, and the first input terminal IN1 is connected to the ground reference GND via the first isolation resistor R3. Since the resistance of the first isolation resistor R3 is much larger than the resistance of the first balancing resistor R1/R2, the stability of the base voltage Vb of the first NPN transistor/the first PNP transistor can be further ensured.
Particularly, the resistance of the first balancing resistor R1/R2 may be 10-50 Ω, and correspondingly, the resistance of the first isolation resistor R3 may be more than 5K Ω.
In addition, in order to ensure the stability of the voltage source, the driving circuit of the push-pull boosting device may further include a filter capacitor C1, and the filter capacitor C1 is electrically connected to the collector of the first NPN transistor. By the filter capacitor C1, the interference component in the voltage source can be filtered out.
Referring to fig. 2, in an embodiment of the present invention, the driving circuit of the push-pull boost device further includes a second driving branch circuit in addition to the first driving branch circuit shown in fig. 1, and the second driving branch circuit converts the second driving signal from the driving chip into a pulse driving current for driving the second group of power switching devices in the push-pull boost device, and the second driving signal is complementary to the first driving signal.
IN this embodiment, the second driving branch includes a second input terminal IN2, a second output terminal OUT2, a third switching tube Q3, a fourth switching tube Q4 and two second balance resistors R4 and R5, and the conduction conditions of the third switching tube Q3 and the fourth switching tube Q4 are opposite (i.e. when the third switching tube Q3 is turned on when the control terminal voltage thereof is high level, the fourth switching tube Q4 is turned on when the control terminal voltage thereof is low level, when the third switching tube Q3 is turned on when the control terminal voltage thereof is low level, the fourth switching tube Q4 is turned on when the control terminal voltage thereof is high level), and the second input terminal IN2 constitutes the input terminal of the second drive branch, and the second output terminal OUT2 constitutes the output terminal of the second drive branch, i.e. the second drive branch receives the second drive signal from the driver chip via the second input IN2, and outputting the pulsed drive current to a second set of power switching devices in the push-pull boost device through a second output terminal OUT 2.
The third switch tube Q3 and the fourth switch tube Q4 are connected IN series between a voltage source Vcc and a ground GND, the second output end OUT2 is electrically connected to a connection point of the third switch tube Q3 and the fourth switch tube Q4, and control ends of the third switch tube Q3 and the fourth switch tube Q4 are electrically connected to the second input end IN2 through a second balancing resistor R4 or R5, respectively, and voltages of the control ends of the third switch tube Q3 and the fourth switch tube Q4 are kept stable at different ambient temperatures by two second balancing resistors R4 and R5, respectively.
The second driving branch circuit converts a second driving signal input by the driving chip into a pulse driving current through the third switching tube Q3 and the fourth switching tube Q4 which are connected in series between the voltage source Vcc and the reference ground so as to drive the power switching device in the push-pull boost device, and compared with a special high-power driving chip, the cost can be greatly reduced. Meanwhile, by adding the second balance resistors R4 and R5 to the control terminals of the third switching tube Q3 and the fourth switching tube Q4, instability of the control terminal voltage caused by parameter changes (generated by temperature changes in extreme environments) of the third switching tube Q3 and the fourth switching tube Q4 can be avoided, and stability of the driving circuit can be greatly improved.
Specifically, the third switching transistor Q3 may be formed by a second NPN type transistor, and the fourth switching transistor Q4 is formed by a second PNP type transistor, where: the second NPN type triode is connected between a voltage source Vcc and a second output end OUT2 in series through a collector and an emitter; the second PNP transistor is connected in series between the second output terminal OUT2 and the ground GND through the emitter and the collector.
IN addition, the second driving branch may further include a second isolation resistor R6, the resistance of the second isolation resistor R6 is greater than one hundred times the resistance of the second balancing resistor R4/R5, and the second input terminal IN2 is connected to the ground GND via the second isolation resistor R6.
Particularly, the resistance of the second balancing resistor R4/R5 is 10-50 Ω, and correspondingly, the resistance of the second balancing resistor R6 is above 5K Ω.
As shown in fig. 3, the embodiment of the present invention further provides an auxiliary power supply, which is used for supplying power to the back-stage SPWM driving board. The auxiliary power supply of the present embodiment includes a driver chip, a push-pull boosting device 32, and the driver circuit 31 of the push-pull boosting device as described above.
Specifically, the push-pull boost device includes a first group of power switches formed by power switches VT1 and VT2 and a second group of power switches formed by power switches VT3 and VT4, and the driving circuit 31 outputs a pulse driving current to the first group of power switches through the first driving branch and outputs a pulse driving current to the second group of power switches through the second driving branch.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A drive circuit of a push-pull boosting device is characterized by comprising a first drive branch circuit, wherein a first drive signal input by a drive chip is converted into pulse drive current for driving a first group of power switching devices in the push-pull boosting device by the first drive branch circuit and is output;
the first driving branch comprises a first input end, a first output end, a first switching tube, a second switching tube and two first balance resistors, the conduction conditions of the first switching tube and the second switching tube are opposite, the first input end forms the input end of the first driving branch, and the first output end forms the output end of the first driving branch; the first switch tube and the second switch tube are connected between a voltage source and a reference ground in series, the first output end is electrically connected with a connection point of the first switch tube and the second switch tube, the control ends of the first switch tube and the second switch tube are respectively electrically connected with the first input end through a first balance resistor, and the two first balance resistors respectively enable the voltages of the control ends of the first switch tube and the second switch tube to be kept stable at different environmental temperatures.
2. The driving circuit of a push-pull boosting device according to claim 1, wherein the first switching tube is formed by a first NPN-type transistor, and the second switching tube is formed by a first PNP-type transistor, wherein: the first NPN type triode is connected between a voltage source and a first output end in series through a collector and an emitter; the first PNP type triode is connected between the first output end and the reference ground in series through an emitter and a collector.
3. The driving circuit of a push-pull boosting device according to claim 2, wherein the first driving branch further comprises a first isolation resistor, a resistance value of the first isolation resistor is greater than one hundred times a resistance value of the first balancing resistor, and the first input terminal is connected to a ground reference via the first isolation resistor.
4. The driving circuit of push-pull boosting device according to claim 3, wherein the first balancing resistor has a resistance value between 10 Ω and 50 Ω.
5. The driving circuit of a push-pull boosting device according to claim 4, further comprising a filter capacitor electrically connected to a collector of the first NPN transistor.
6. The driving circuit of a push-pull boosting device according to any one of claims 1 to 5, wherein the driving circuit comprises a second driving branch, and a second driving signal from a driving chip is converted into a pulse driving current for driving a second group of power switching devices in the push-pull boosting device by the second driving branch, and the second driving signal is complementary to the first driving signal;
the second driving branch comprises a second input end, a second output end, a third switching tube, a fourth switching tube and two second balance resistors, the conduction conditions of the third switching tube and the fourth switching tube are opposite, the second input end forms the input end of the second driving branch, and the second output end forms the output end of the second driving branch; the third switch tube and the fourth switch tube are connected in series between a voltage source and a reference ground, the second output end is electrically connected with a connection point of the third switch tube and the fourth switch tube, the control ends of the third switch tube and the fourth switch tube are respectively electrically connected with the second input end through a second balance resistor, and the two second balance resistors respectively enable the voltages of the control ends of the third switch tube and the fourth switch tube to be kept stable at different environmental temperatures.
7. The driving circuit of a push-pull boosting device according to claim 6, wherein said third switching transistor is formed by a second NPN type transistor, and said fourth switching transistor is formed by a second PNP type transistor, wherein: the second NPN type triode is connected between a voltage source and a second output end in series through a collector and an emitter; the second PNP type triode is connected between the second output end and the reference ground in series through an emitter and a collector.
8. The driving circuit of a push-pull boosting device according to claim 7, wherein the second driving branch further comprises a second isolation resistor, a resistance value of the second isolation resistor is greater than one hundred times a resistance value of the second balancing resistor, and the second input terminal is connected to the ground reference via the second isolation resistor.
9. The driving circuit of push-pull boosting device according to claim 8, wherein the second balancing resistor has a resistance value between 10 Ω and 50 Ω.
10. An auxiliary power supply for powering a subsequent SPWM driving board, wherein the auxiliary power supply comprises a driving chip, a push-pull boost device and a driving circuit of the push-pull boost device according to any of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122409126.2U CN216437067U (en) | 2021-09-30 | 2021-09-30 | Drive circuit and auxiliary power supply of push-pull boosting device |
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| CN202122409126.2U CN216437067U (en) | 2021-09-30 | 2021-09-30 | Drive circuit and auxiliary power supply of push-pull boosting device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115800970A (en) * | 2023-01-29 | 2023-03-14 | 永联智慧能源科技(常熟)有限公司 | Multi-channel PWM wave push-pull output device and method capable of switching level |
| CN117045962A (en) * | 2023-10-11 | 2023-11-14 | 泉州艾奇科技有限公司 | Micro-electric radio frequency control circuit and beauty instrument |
-
2021
- 2021-09-30 CN CN202122409126.2U patent/CN216437067U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115800970A (en) * | 2023-01-29 | 2023-03-14 | 永联智慧能源科技(常熟)有限公司 | Multi-channel PWM wave push-pull output device and method capable of switching level |
| CN117045962A (en) * | 2023-10-11 | 2023-11-14 | 泉州艾奇科技有限公司 | Micro-electric radio frequency control circuit and beauty instrument |
| CN117045962B (en) * | 2023-10-11 | 2024-01-30 | 泉州艾奇科技有限公司 | Micro-electric radio frequency control circuit and beauty instrument |
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