CN219625907U - Enable control low-power consumption linear voltage stabilizer - Google Patents
Enable control low-power consumption linear voltage stabilizer Download PDFInfo
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- CN219625907U CN219625907U CN202321393857.5U CN202321393857U CN219625907U CN 219625907 U CN219625907 U CN 219625907U CN 202321393857 U CN202321393857 U CN 202321393857U CN 219625907 U CN219625907 U CN 219625907U
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Abstract
The low-power consumption switching circuit is connected to the power-taking side of the linear voltage stabilizing circuit and is controlled to be on-off by an enabling signal; the pulse suppression circuit is connected between the battery and the low-power-consumption switching circuit and comprises a triode Q1, wherein a collector electrode of the triode Q1 is connected with the battery, an emitter electrode of the triode Q1 is connected to the low-power-consumption switching circuit, one path of a base electrode of the triode Q1 is connected with a power supply through a resistor R1, the other path of the base electrode of the triode Q1 is grounded through a voltage stabilizing diode DZ1, a voltage stabilizing value of the voltage stabilizing diode DZ1 is larger than the highest working voltage of the battery and smaller than the highest withstand voltage of the linear voltage stabilizing circuit, the battery is blocked from flowing to the ground when the circuit works normally so as to maintain low-power-consumption operation, and the power supply voltage to the linear voltage stabilizing circuit is limited when pulse voltage is generated. The structure form of the separation module reduces the complexity of the circuit, has lower cost, can be suitable for being used in the occasion with surge power supply, and has the functions of switch control and low power consumption.
Description
Technical Field
The utility model relates to a power supply circuit of a vehicle-mounted low-voltage battery, in particular to an enable control low-power consumption linear voltage stabilizer.
Background
The vehicle-mounted battery is used for supplying power to the vehicle-mounted electronic system, and when the electronic system does not work, the battery power supply circuit is in a dormant standby state, the leakage current of the battery is required to be less than 30ua, and the vehicle-mounted battery has low power consumption performance. When electricity is needed, the power supply circuit can be awakened by the enabling signal, energy is obtained from the battery and converted into a stable voltage, and the operation of the MCU and the control circuit in the product can be supported. In addition, during the operation of the system, when the system is switched to a battery power supply state, spike pulses which are greatly higher than the power supply voltage are generated, and the power supply circuit is also required to be ensured not to be damaged. The common solution is to design a high-performance low-power consumption LDO (linear voltage regulator circuit), but the integrated circuit design is complex, resulting in higher cost.
Disclosure of Invention
The utility model provides an enabling control low-power consumption linear voltage stabilizer based on a traditional LDO, so as to simplify the design scheme and reduce the cost.
The technical scheme adopted by the utility model for solving the technical problems is as follows: the low-power consumption switching circuit is connected with the power-taking side of the linear voltage stabilizing circuit and is controlled to be on-off by an enabling signal so as to control power supply to the linear voltage stabilizing circuit; the pulse suppression circuit is connected between the battery and the low-power consumption switching circuit and comprises an NPN triode Q1, wherein the collector of the triode Q1 is connected with the battery, the emitter of the triode Q1 is connected to the low-power consumption switching circuit, one way of the base of the triode Q1 is connected with a power supply through a resistor R1, the other way of the base of the triode Q1 is grounded through a voltage stabilizing diode DZ1, the voltage stabilizing value of the voltage stabilizing diode DZ1 is larger than the highest working voltage of the battery and smaller than the highest withstand voltage of the linear voltage stabilizing circuit, so that the voltage stabilizing diode DZ1 blocks the ground current of the battery when the circuit works normally to maintain low-power consumption operation, and breaks down when the battery generates pulse voltage to limit the power supply voltage of the linear voltage stabilizing circuit.
The emitter of the triode Q1 is grounded through a capacitor C1.
An emitter of the triode Q1 is connected with a current limiting resistor R2.
The low-power consumption switching circuit comprises a triode Q2, and the triode Q2 is directly or indirectly controlled to be on-off by an enabling signal so as to control power supply to the linear voltage stabilizing circuit.
The triode Q2 is a PNP triode, the emitter of the triode Q2 is connected with the pulse suppression circuit, and the collector of the triode Q2 is connected to the linear voltage stabilizing circuit; the base electrode and the emitter electrode of the triode Q2 are connected through a resistor R3, and the base electrode of the triode Q2 is grounded through a resistor R4 and the triode Q3 which is controlled to be switched on and off by an enabling signal.
The enable signal is transmitted to the triode Q3 by a control bus or a battery management unit.
A control unit is also provided for detecting the enable signal and outputting a self-locking signal to the triode Q3.
The linear voltage stabilizing circuit comprises a linear voltage stabilizer, wherein the input end of the linear voltage stabilizer is connected with a capacitor C2, and the output end of the linear voltage stabilizer is connected with a capacitor C3.
The beneficial effects of the utility model are as follows: the common linear voltage stabilizing circuit (LDO) is matched with the pulse suppression circuit and the low-power consumption switching circuit, the complexity of the circuit is reduced due to the structural form of the separation module, related devices are easy to obtain, and the cost is lower. The pulse suppression circuit can suppress pulse voltage generated by the battery and protect the rear-end linear voltage stabilizing circuit from being damaged. When the power supply circuit works normally and no enabling signal is generated, leakage currents of the pulse suppression circuit and the low-power-consumption switching circuit are extremely low, and low power consumption of the circuit is guaranteed. The circuit of the utility model can be suitable for use in surge power supply occasions, has the functions of switch control and low power consumption, can achieve leakage current of less than 30ua when not enabled, and can support 100mA current when enabled.
Drawings
Fig. 1 is a schematic circuit configuration of the present utility model.
Fig. 2 is a schematic diagram of the structure of the pulse suppression circuit.
Fig. 3 is a schematic diagram of a low power switching circuit.
Fig. 4 is a schematic diagram of a linear voltage stabilizing circuit.
FIG. 5 is a schematic diagram of an enable wake-up circuit of a low power switching circuit.
The marks in the figure: 1. pulse suppression circuit 2, low-power consumption switching circuit, 3, linear voltage stabilizing circuit.
Detailed Description
The technical scheme of the utility model is clearly and completely described below with reference to the accompanying drawings and the specific embodiments. The specific matters listed in the following examples are not limited to the technical features necessary for solving the technical problems of the technical solutions described in the claims. Meanwhile, the list is only a part of embodiments of the present utility model, but not all embodiments.
As shown in fig. 1, the enable control low power consumption linear voltage regulator of the present utility model includes a pulse suppression circuit 1, a low power consumption switching circuit 2, and a linear voltage stabilizing circuit 3. The linear voltage stabilizing circuit 3 is used for converting the electric energy supplied by the battery into a stable voltage for supporting the operation of the MCU and the control circuit in the product. The power taking side of the linear voltage stabilizing circuit 3 is connected with the low-power consumption switching circuit 2, and the low-power consumption switching circuit 2 controls the on-off of a power supply circuit of the linear voltage stabilizing circuit according to an enabling signal.
As shown in fig. 3, the low-power switching circuit 2 includes a triode Q2, and the triode Q2 is connected to the power-taking side of the linear voltage stabilizing circuit 3 and is controlled to be turned on or off by an enable signal, so as to control power supply to the linear voltage stabilizing circuit. The triode Q2 can be directly controlled by an enabling signal, and as shown in fig. 3, a triode Q3 can be connected to the base electrode of the triode Q2, the triode Q3 is controlled to be on-off by the enabling signal, the base electrode of the triode Q2 is further controlled to be on or off to the ground, and the triode Q2 is indirectly controlled.
In the illustrated embodiment, the transistor Q2 is a PNP transistor, and its emitter is connected to the pulse suppression circuit 1, and its collector is connected to the linear voltage regulator circuit 3. The base and emitter of transistor Q2 are connected via resistor R3. When the enable signal is not applied, the transistor Q3 is not conducted, the base potential of the transistor Q2 is pulled up to the emitter potential by the resistor R3, and the transistor Q2 is not conducted. Since the transistor leakage current exceeding 100V withstand voltage is very small, this partial switch is very low leakage current when neither Q2 nor Q3 is on. When the enabling signal controls the triode Q3 to be conducted, the potential of the base electrode of the triode Q2 is pulled down, and the current to the ground is formed through the resistor R4, and at the moment, the triode Q2 is conducted to supply power to the linear voltage stabilizing circuit 3. Because the amplification factor of the triode is larger, the Q2 and Q3 can be completely conducted basically, and therefore the opening function of the switch is realized.
The pulse suppression circuit 1 is connected between the battery and the low-power consumption switch circuit 2, as shown in fig. 1, and comprises an NPN transistor Q1, a collector of the transistor Q1 is connected to the output v_battery of the battery, and an emitter is connected to the low-power consumption switch circuit 2. The base of the triode Q1 is connected with a power supply through a resistor R1. The voltage derived from the power supply v_battery forms a current through R1 at be of transistor Q1, which turns on transistor Q1. The emitter of the triode Q1 is connected with a current limiting resistor R2 and a grounded capacitor C1. The base electrode of the triode Q1 is connected with a grounded voltage stabilizing diode DZ1, and the voltage stabilizing value of the voltage stabilizing diode DZ1 is larger than the highest working voltage of the battery and smaller than the highest withstand voltage of the linear voltage stabilizing circuit. For example, a 12V battery pack (the voltage of a battery platform is generally 16V at the highest), the voltage stabilizing diode can be selected to be more than 18V, and the linear voltage stabilizing circuit LDO at the rear end can generally support 32V, namely, the voltage stabilizing diode of 18-30V can be selected.
Normally, because the voltage on the v_battery is smaller than the voltage stabilizing value of the voltage stabilizing diode DZ1, the voltage stabilizing diode DZ1 blocks the current to the ground, the b pole of the triode Q1 can obtain the current from the v_battery, and then the triode Q1 can be over-current from the c pole to the e pole, so that the battery can supply power to the low-power-consumption switch circuit 2 and the linear voltage stabilizing circuit 3. The leakage current generated at this time is basically only the leakage current of the zener diode DZ1, and can maintain low-power operation. If the pulse voltage appears in the battery power supply, a spike pulse on the battery V_battery exceeds the voltage stabilizing value of the voltage stabilizing diode DZ1, the voltage stabilizing diode DZ1 is instantly conducted, and the voltage on the capacitor C1 is clamped by the voltage stabilizing diode DZ1 and the triode Q1 to limit the power supply voltage of the linear voltage stabilizing circuit.
As shown in fig. 4, the linear voltage stabilizing circuit includes a linear voltage stabilizer U1 for converting the battery output voltage into a stable supply voltage for the back-end electronics. The input end of the linear voltage stabilizer U1 is connected with a capacitor C2, and the output end is connected with a capacitor C3. The function of obtaining energy from the capacitor C2 and converting the energy into the capacitor C3 to stably supply power is realized, the self leakage current is larger, but the self leakage current is matched with the previous low-power-consumption switching circuit, the leakage current cannot be generated when the voltage of the capacitor C2 is not applied, and the low-power-consumption switching circuit is turned on, so that the voltage-stabilizing supply of energy from the capacitor C2 to the capacitor C3 can be realized.
As shown in fig. 5, the enable signal may include a wake-up signal from the battery management unit BMS and a wake-up signal from the control bus CAN. The wake-up signal from either the BMS or CAN CAN control the low power switching circuit to turn on. After the enable signal controls the low-power consumption switch circuit to be conducted, the control unit MCU outputs a self-locking signal LOCK to be kept conducted. The control unit MCU is powered by the output voltage of the linear voltage stabilizing circuit, and the circuit is not woken up, so that a self-locking signal cannot be sent. The control unit MCU is connected with a detection circuit for detecting the wake-up state of the circuit, and when the wake-up circuit is enabled, the control unit MCU sends out a self-locking signal based on the detected wake-up signal, and the circuit is kept on.
The above description of the specific embodiments is only for aiding in understanding the technical concept of the present utility model and its core idea, and although the technical solution has been described and illustrated using specific preferred embodiments, it should not be construed as limiting the present utility model itself. Workers skilled in the art will recognize that changes may be made in form and detail without departing from the spirit of the technology. Such modifications and substitutions are intended to be included within the scope of the present utility model.
Claims (8)
1. An enable control low power consumption linear voltage regulator, characterized by: the power supply circuit comprises a pulse suppression circuit, a low-power-consumption switching circuit and a linear voltage stabilizing circuit, wherein the low-power-consumption switching circuit is connected with the power taking side of the linear voltage stabilizing circuit and is controlled to be on-off by an enabling signal so as to control power supply to the linear voltage stabilizing circuit; the pulse suppression circuit is connected between the battery and the low-power consumption switching circuit and comprises an NPN triode Q1, wherein the collector of the triode Q1 is connected with the battery, the emitter of the triode Q1 is connected to the low-power consumption switching circuit, one way of the base of the triode Q1 is connected with a power supply through a resistor R1, the other way of the base of the triode Q1 is grounded through a voltage stabilizing diode DZ1, the voltage stabilizing value of the voltage stabilizing diode DZ1 is larger than the highest working voltage of the battery and smaller than the highest withstand voltage of the linear voltage stabilizing circuit, so that the voltage stabilizing diode DZ1 blocks the ground current of the battery when the circuit works normally to maintain low-power consumption operation, and breaks down when the battery generates pulse voltage to limit the power supply voltage of the linear voltage stabilizing circuit.
2. An enable control low power linear voltage regulator as claimed in claim 1, wherein: the emitter of the triode Q1 is grounded through a capacitor C1.
3. An enable control low power linear voltage regulator as claimed in claim 1, wherein: an emitter of the triode Q1 is connected with a current limiting resistor R2.
4. An enable control low power linear voltage regulator as claimed in claim 1, wherein: the low-power consumption switching circuit comprises a triode Q2, and the triode Q2 is directly or indirectly controlled to be on-off by an enabling signal so as to control power supply to the linear voltage stabilizing circuit.
5. An enable control low power linear voltage regulator as claimed in claim 4, wherein: the triode Q2 is a PNP triode, the emitter of the triode Q2 is connected with the pulse suppression circuit, and the collector of the triode Q2 is connected to the linear voltage stabilizing circuit; the base electrode and the emitter electrode of the triode Q2 are connected through a resistor R3, and the base electrode of the triode Q2 is grounded through a resistor R4 and the triode Q3 which is controlled to be switched on and off by an enabling signal.
6. An enable control low power linear voltage regulator as claimed in claim 5, wherein: the enable signal is transmitted to the triode Q3 by a control bus or a battery management unit.
7. An enable control low power linear voltage regulator as claimed in claim 5, wherein: a control unit is also provided for detecting the enable signal and outputting a self-locking signal to the triode Q3.
8. An enable control low power linear voltage regulator as claimed in claim 1, wherein: the linear voltage stabilizing circuit comprises a linear voltage stabilizer, wherein the input end of the linear voltage stabilizer is connected with a capacitor C2, and the output end of the linear voltage stabilizer is connected with a capacitor C3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321393857.5U CN219625907U (en) | 2023-06-02 | 2023-06-02 | Enable control low-power consumption linear voltage stabilizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321393857.5U CN219625907U (en) | 2023-06-02 | 2023-06-02 | Enable control low-power consumption linear voltage stabilizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219625907U true CN219625907U (en) | 2023-09-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321393857.5U Active CN219625907U (en) | 2023-06-02 | 2023-06-02 | Enable control low-power consumption linear voltage stabilizer |
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| Country | Link |
|---|---|
| CN (1) | CN219625907U (en) |
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2023
- 2023-06-02 CN CN202321393857.5U patent/CN219625907U/en active Active
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