CN215071740U - Power battery voltage reduction circuit and power supply system - Google Patents
Power battery voltage reduction circuit and power supply system Download PDFInfo
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- CN215071740U CN215071740U CN202121352167.6U CN202121352167U CN215071740U CN 215071740 U CN215071740 U CN 215071740U CN 202121352167 U CN202121352167 U CN 202121352167U CN 215071740 U CN215071740 U CN 215071740U
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Abstract
The application discloses power battery step-down circuit, including first resistance, second resistance, first filtering unit, second filtering unit, stabilivolt, controllable switch pipe and LDO chip, wherein: the first end of the first resistor and the first end of the second resistor are both connected with the voltage output end of the power battery; the second end of the first resistor is connected with the first end of the first filtering unit and the first end of the controllable switching tube; the second end of the second resistor is connected with the control end of the controllable switch tube and the cathode of the voltage stabilizing tube; the second end of the controllable switch tube is connected with the first end of the second filtering unit and the voltage input end of the LDO chip; and the anode of the voltage regulator tube, the second end of the first filtering unit, the second end of the second filtering unit and the grounding end of the LDO chip are all grounded. The power battery voltage reduction circuit realizes the voltage reduction effect of the DCDC chip through the circuit elements with lower cost, and meanwhile, the power consumption is lower, and the power battery voltage reduction circuit is more economical. The application also correspondingly discloses a power supply system.
Description
Technical Field
The utility model relates to a power design field, in particular to power battery step-down circuit and power supply system.
Background
With the increase of the attention of internet enterprises to the field of living and traveling, the intelligent and personalized electric transportation tool has become a development trend of electric vehicles and other electric transportation tools. In the electric walk-substituting tool, the difference between the power voltage provided by the power battery and the rated voltage of the control chip is larger, and the power battery must pass through the voltage reduction circuit when supplying power for the control chip. Because the maximum working voltage of a Low Dropout Regulator (LDO) chip is about 24V, and the voltage of a power battery is about 50V, the LDO chip cannot step down the voltage of the power battery, the current step-down circuit scheme available for the power battery is only a DCDC chip. However, the DCDC chip has high power consumption and cost, and it is a problem that those skilled in the art need to solve to break through the bottleneck of the voltage reduction circuit that is not economical and energy-saving.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a power battery voltage reduction circuit and a power supply system with low energy consumption and low cost. The specific scheme is as follows:
the utility model provides a power battery step-down circuit, includes first resistance, second resistance, first filter unit, second filter unit, stabilivolt, controllable switch pipe and LDO chip, wherein:
the first end of the first resistor and the first end of the second resistor are both connected with the voltage output end of the power battery;
the second end of the first resistor is connected with the first end of the first filtering unit and the first end of the controllable switch tube;
the second end of the second resistor is connected with the control end of the controllable switch tube and the cathode of the voltage regulator tube;
the second end of the controllable switch tube is connected with the first end of the second filtering unit and the voltage input end of the LDO chip;
and the anode of the voltage regulator tube, the second end of the first filtering unit, the second end of the second filtering unit and the grounding end of the LDO chip are all grounded.
Preferably, the controllable switch tube is an NMOS tube, wherein a drain of the NMOS tube is used as the first end of the controllable switch tube, and a source of the NMOS tube is used as the second end of the controllable switch tube.
Preferably, the resistance value of the first resistor is 2k Ω, and the resistance value of the second resistor is 10M Ω.
Preferably, the controllable switch tube is an NPN triode, wherein a collector of the NPN triode serves as a first end of the controllable switch tube, and an emitter of the NPN triode serves as a second end of the controllable switch tube.
Preferably, the first filtering unit and the second filtering unit specifically include capacitors.
Preferably, the second filtering unit comprises two capacitors connected in parallel and having model number 106/25V.
Preferably, the power battery voltage reduction circuit further comprises a diode;
the first end of the first resistor and the second end of the second resistor are connected with the voltage output end of the power battery through the diode;
the internal current of the diode flows from the voltage output end of the power battery.
Preferably, the power battery voltage reduction circuit further comprises a third filtering unit, a first end of the third filtering unit is connected with the voltage output end of the LDO chip, and a second end of the third filtering unit is grounded.
Preferably, the LDO chip is a low-power LDO chip with the model number UR7533G-AB 3-R.
Correspondingly, this application still discloses a power supply system, includes: the power battery voltage reduction circuit, the power battery and the control chip are connected with the voltage output end of the LDO chip of the power battery voltage reduction circuit.
The application discloses power battery step-down circuit, including first resistance, second resistance, first filtering unit, second filtering unit, stabilivolt, controllable switch pipe and LDO chip, wherein: the first end of the first resistor and the first end of the second resistor are both connected with the voltage output end of the power battery; the second end of the first resistor is connected with the first end of the first filtering unit and the first end of the controllable switch tube; the second end of the second resistor is connected with the control end of the controllable switch tube and the cathode of the voltage regulator tube; the second end of the controllable switch tube is connected with the first end of the second filtering unit and the voltage input end of the LDO chip; and the anode of the voltage regulator tube, the second end of the first filtering unit, the second end of the second filtering unit and the grounding end of the LDO chip are all grounded. The power battery voltage reduction circuit realizes the voltage reduction effect of the DCDC chip through the circuit elements with lower cost, and meanwhile, the power consumption is lower, and the power battery voltage reduction circuit is more economical.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a structural distribution diagram of a power battery voltage reduction circuit according to an embodiment of the present invention;
fig. 2 is a structural distribution diagram of another power battery voltage reduction circuit according to an embodiment of the present invention;
fig. 3 is a structural distribution diagram of a power supply system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the electric walk-substituting tool, the power supply voltage provided by the power battery has a large difference with the rated voltage of the BMS, and the power battery must pass through a voltage reduction circuit when supplying power to the BMS. Because the maximum working voltage of the LDO chip is about 24V, and the voltage of the power battery is about 50V, the LDO chip can not step down the voltage of the power battery, and therefore, only a DCDC chip with high power consumption and cost is available in the current step-down circuit scheme of the power battery. The power battery voltage reduction circuit realizes the voltage reduction effect of the DCDC chip through the circuit elements with lower cost, and meanwhile, the power consumption is lower, and the power battery voltage reduction circuit is more economical.
The embodiment of the utility model discloses power battery voltage reduction circuit, it is shown with reference to fig. 1, including first resistance R1, second resistance R2, first filtering unit F1, second filtering unit F2, stabilivolt Z, controllable switch pipe Q and LDO chip U1, wherein:
the first end of the first resistor R1 and the first end of the second resistor R2 are both connected with the voltage output end B + of the power battery;
the second end of the first resistor R1 is connected with the first end of the first filtering unit F1 and the first end of the controllable switch tube Q;
the second end of the second resistor R2 is connected with the control end of the controllable switch tube Q and the cathode of the voltage regulator tube Z;
the second end of the controllable switch tube Q is connected with the first end of the second filtering unit F2 and the voltage input end of the LDO chip U1;
the anode of the voltage regulator tube Z, the second end of the first filtering unit F1, the second end of the second filtering unit F2, and the ground end of the LDO chip U1 are all grounded.
Specifically, in this embodiment, the controllable switch tube Q may be an NMOS tube or an NPN triode, and when the controllable switch tube Q is an NMOS tube, a drain of the NMOS tube serves as a first end of the controllable switch tube Q, and a source of the NMOS tube serves as a second end of the controllable switch tube Q, as shown in fig. 1, an example of the NMOS tube serving as the controllable switch tube Q is illustrated. When the controllable switch tube Q is an NPN transistor, a collector of the NPN transistor serves as a first end of the controllable switch tube Q, and an emitter of the NPN transistor serves as a second end of the controllable switch tube Q, as shown in fig. 2. Since the operation principle of the NPN transistor and the NMOS transistor in this embodiment is similar, only the NMOS transistor is used for example in the following analysis.
When the controllable switch tube Q is an NMOS tube, the control end, the first end, and the second end of the controllable switch tube Q, that is, the gate, the drain, and the source, are respectively represented by pins 1, 2, and 3 in fig. 1, and the voltage reduction circuit of the power battery is analyzed: voltage V of B + of the power battery in this embodimentB+The voltage of the 1 pin of the controllable switch tube Q can be stabilized at a voltage value, such as 12V, by using the voltage regulator tube Z, which is usually between 27V and 60V. The second resistor R2 is used for limiting current, and is usually larger in resistance, and is optionally 10M Ω. Similarly, the first resistor R1 also plays a role of current limiting to control the voltage of the 2-pin of the controllable switch Q, the resistance of the first resistor R1 can be selected to be 2k Ω, and when the rear end working current is 5mA, the voltage drop V of the first resistor R1 isR1Is 10V; the voltage value of the 2 pin of the controllable switch tube Q is according to V2＝VB+-VR1Determine if V is presentB+50V, the voltage value V of 2 pinsR1Is 40V, the controllable switch tube Q is conducted, and after the conductionThe relation of the three-terminal voltage of the controllable switching tube Q is changed, the controllable switching tube Q is turned off again and then turned on after being turned off, and the controllable switching tube Q is always in a circulating state of the rapid switch; at this moment, the pin 3 of the controllable switch tube Q is connected with the voltage input end of the second filter unit F2 and the LDO chip U1, so that the voltage of the pin 3 is guaranteed to be stabilized at a value slightly smaller than the voltage of the pin 1, for example, about 10V, and the LDO chip U1 is connected to the voltage value and outputs the voltage value by reducing the voltage value to 3.3V, thereby supplying power to the control chip, which is generally an MCU or a single chip microcomputer. At this time, the first filtering unit F1 and the second filtering unit F2 are specifically configured to filter the fast switching of the controllable switch Q.
Further, the first filtering unit F1 and the second filtering unit F2 may be implemented by combining and matching capacitors, inductors and resistors, but considering the cost and the filtering effect, the effect of only using capacitors is sufficient. Specifically, the first filtering unit F1 can select a capacitor with a model of 105/100V, and the second filtering unit F2 can select a capacitor with a model of 226/25V, or two capacitors connected in parallel and with a model of 106/25V, which is lower in cost.
Furthermore, the power battery voltage reduction circuit further comprises a third filtering unit F3, a first end of the third filtering unit F3 is connected to the voltage output end of the LDO chip U1, and a second end of the third filtering unit F3 is grounded. Specifically, the third filtering unit F3 may select a capacitor with a model number of 226/10V.
Specifically, in the embodiment, the model of the voltage regulator tube Z may be BZT52C12, the signal of the NMOS tube may be NCE0110AK, and the LDO chip U1 is specifically a low-power LDO chip with the model UR7533G-AB 3-R. At this time, the power consumption of the front-end circuit of the LDO chip U1 depends on the voltage of the voltage output end B + of the power battery, when V isB+The power consumption of the front-end circuit is about 10uA when the voltage is 27V.
Different from the DCDC chip, the LDO chip can control the power battery voltage reduction circuit to enter a sleep state, the maximum value of sleep power consumption is 3uA, and the power battery voltage reduction circuit in the embodiment has a wider application scene.
Further, considering the safety of the power battery, the power battery voltage reduction circuit may further include a diode D;
a first end of the first resistor R1 and a second end of the second resistor R2 are both connected with a voltage output end B + of the power battery through the diode D;
the internal current of the diode D flows in from the voltage output terminal B + of the power battery.
A common power battery, for example, an electric vehicle battery pack including 13 strings of lithium batteries, has a total battery voltage of about 4.2V by 13V-54.6V, which is far higher than the maximum voltage of the LDO chip, and cannot be directly stepped down by the LDO chip. In the embodiment, the output voltage of the power battery is stabilized within the input voltage range of the LDO by the combination of the controllable switch tube Q and the voltage regulator tube Z, and then is reduced to 3.3V by the LDO chip U1 for output. The scheme can replace a voltage reduction scheme of a DCDC chip on the market, the bottleneck that the DCDC chip is high in power consumption and cost is solved, the device cost exceeds 3 yuan compared with the original voltage reduction scheme, and the voltage reduction circuit can control the cost to be about 1 yuan in the embodiment.
The application discloses power battery step-down circuit, including first resistance, second resistance, first filtering unit, second filtering unit, stabilivolt, controllable switch pipe and LDO chip, wherein: the first end of the first resistor and the first end of the second resistor are both connected with the voltage output end of the power battery; the second end of the first resistor is connected with the first end of the first filtering unit and the first end of the controllable switch tube; the second end of the second resistor is connected with the control end of the controllable switch tube and the cathode of the voltage regulator tube; the second end of the controllable switch tube is connected with the first end of the second filtering unit and the voltage input end of the LDO chip; and the anode of the voltage regulator tube, the second end of the first filtering unit, the second end of the second filtering unit and the grounding end of the LDO chip are all grounded. The power battery voltage reduction circuit realizes the voltage reduction effect of the DCDC chip through the circuit elements with lower cost, and meanwhile, the power consumption is lower, and the power battery voltage reduction circuit is more economical.
Correspondingly, the embodiment of the present application further discloses a power supply system, as shown in fig. 3, including: the power battery voltage reduction circuit 1, the power battery 2 and the control chip 3 are connected with the voltage output end of the LDO chip of the power battery voltage reduction circuit.
For details of the power battery voltage reduction circuit 1, reference may be made to the description in the above embodiments, and details are not repeated here.
The power supply system in this embodiment has the same technical effect as the power battery voltage reduction circuit 1 in the above embodiments, and details are not repeated here.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, scheme, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, scheme, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, scheme, article or apparatus that comprises the element.
The power battery voltage reduction circuit and the power supply system provided by the utility model are introduced in detail, the principle and the implementation mode of the utility model are explained by applying specific examples, and the description of the above examples is only used for helping to understand the scheme and the core idea of the utility model; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.
Claims (10)
1. The utility model provides a power battery step-down circuit, its characterized in that includes first resistance, second resistance, first filter unit, second filter unit, stabilivolt, controllable switch tube and LDO chip, wherein:
the first end of the first resistor and the first end of the second resistor are both connected with the voltage output end of the power battery;
the second end of the first resistor is connected with the first end of the first filtering unit and the first end of the controllable switch tube;
the second end of the second resistor is connected with the control end of the controllable switch tube and the cathode of the voltage regulator tube;
the second end of the controllable switch tube is connected with the first end of the second filtering unit and the voltage input end of the LDO chip;
and the anode of the voltage regulator tube, the second end of the first filtering unit, the second end of the second filtering unit and the grounding end of the LDO chip are all grounded.
2. The voltage reduction circuit for the power battery according to claim 1, wherein the controllable switch tube is an NMOS tube, a drain of the NMOS tube serves as the first end of the controllable switch tube, and a source of the NMOS tube serves as the second end of the controllable switch tube.
3. The power battery voltage reduction circuit according to claim 2, wherein the first resistor has a resistance of 2k Ω, and the second resistor has a resistance of 10M Ω.
4. The power battery voltage reduction circuit according to claim 1, wherein the controllable switch tube is an NPN transistor, a collector of the NPN transistor serves as the first end of the controllable switch tube, and an emitter of the NPN transistor serves as the second end of the controllable switch tube.
5. The power battery voltage reduction circuit according to claim 1, wherein the first filter unit and the second filter unit specifically comprise capacitors.
6. The power battery voltage reduction circuit according to claim 5, wherein the second filtering unit comprises two capacitors connected in parallel and having model number 106/25V.
7. The power battery voltage reduction circuit according to any one of claims 1 to 6, further comprising a diode;
the first end of the first resistor and the second end of the second resistor are connected with the voltage output end of the power battery through the diode;
the internal current of the diode flows from the voltage output end of the power battery.
8. The power battery voltage reduction circuit according to claim 7, further comprising a third filtering unit, wherein a first end of the third filtering unit is connected to the voltage output end of the LDO chip, and a second end of the third filtering unit is grounded.
9. The power battery voltage reduction circuit of claim 8, wherein the LDO chip is a low power LDO chip with model number UR7533G-AB 3-R.
10. A power supply system, comprising: the power battery voltage reduction circuit of any one of claims 1 to 9, a power battery, and a control chip connected to a voltage output terminal of the LDO chip of the power battery voltage reduction circuit.
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| CN202121352167.6U CN215071740U (en) | 2021-06-17 | 2021-06-17 | Power battery voltage reduction circuit and power supply system |
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| CN202121352167.6U CN215071740U (en) | 2021-06-17 | 2021-06-17 | Power battery voltage reduction circuit and power supply system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113258649A (en) * | 2021-06-17 | 2021-08-13 | 山东爱德邦智能科技有限公司 | Power battery voltage reduction circuit and power supply system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113258649A (en) * | 2021-06-17 | 2021-08-13 | 山东爱德邦智能科技有限公司 | Power battery voltage reduction circuit and power supply system |
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