Power supply control device

Abstract

The invention provides a power supply control device, and the device comprises a power supply control unit which comprises a power supply control switch, a first divider resistor, and a second divider resistor; the driving unit is used for driving the power supply control switch to be switched on and switched off; wherein a power source is connected to a power supply output end through the first divider resistor, the power supply output end is connected to a reference potential point through the second divider resistor, the power supply control switch is connected with the first divider resistor in parallel, and under the condition that the power supply control switch is switched off, the reference potential point is connected to the reference potential point. When the power supply control switch is switched on, the power supply output end outputs first power supply voltage, when the power supply control switch is switched on, the power supply output end outputs second power supply voltage, and the second power supply voltage is larger than the first power supply voltage.

Description

Technical Field

[0001] This disclosure relates to a power supply control device. Background Technology

[0002] Vehicles are equipped with numerous sensors. The vehicle's control unit communicates with these sensors to control them and acquire data from them. Furthermore, the control unit also manages the power supply to the sensors. Summary of the Invention

[0003] This disclosure provides a power supply control device through which a central controller can control the power supply to sensors or other components in a vehicle via small signals and can detect the power supply status.

[0004] This disclosure provides a power supply control device, comprising: a power supply control unit including a power supply control switch, a first voltage divider resistor, and a second voltage divider resistor; and a drive unit for driving the power supply control switch to be turned on and off; wherein a power supply is connected to a power supply output terminal through the first voltage divider resistor, the power supply output terminal is connected to a reference potential point through the second voltage divider resistor, the power supply control switch is connected in parallel with the first voltage divider resistor, and wherein, when the power supply control switch is off, the power supply output terminal outputs a first power supply voltage, and when the power supply control switch is on, the power supply output terminal outputs a second power supply voltage, wherein the second power supply voltage is greater than the first power supply voltage.

[0005] In an embodiment according to this disclosure, the driving unit includes a driving switch, a first bias element, and a second bias element, wherein the power supply control switch and the driving switch are configured as electronic switches, the first bias element is disposed between the emitter or drain of the power supply control switch and the control electrode, and a series circuit consisting of the second bias element and the driving switch is disposed between the control electrode of the power supply control switch and the reference potential point, and wherein the power supply control switch is controlled to be turned on and off by turning the driving switch on and off.

[0006] In an embodiment according to this disclosure, the power supply control switch is configured as a PNP transistor, the drive switch is configured as an NPN transistor, and wherein the disconnection of the drive switch drives the power supply control switch to disconnect, and the connection of the drive switch drives the power supply control switch to connect.

[0007] In embodiments according to this disclosure, the first biasing element and the second biasing element are configured as resistors.

[0008] In an embodiment according to this disclosure, the first biasing element is configured as at least one diode for achieving constant current output when the power supply control switch is turned on, and the second biasing element is configured as a resistor.

[0009] In an embodiment according to this disclosure, the power supply control unit further includes a current-limiting resistor connected in series with the power supply control switch.

[0010] In an embodiment according to this disclosure, the power supply control unit further includes a third voltage divider resistor, and the power supply output terminal is connected to the reference potential point through the second voltage divider resistor and the third voltage divider resistor, forming a power supply voltage detection terminal between the second voltage divider resistor and the third voltage divider resistor.

[0011] In an embodiment according to this disclosure, a filter capacitor is arranged at the power supply voltage detection terminal.

[0012] In an embodiment according to this disclosure, a voltage clamping diode is arranged at the power supply voltage detection terminal.

[0013] In embodiments according to this disclosure, the power supply control device further includes a reverse polarity protection diode, wherein the reverse polarity protection diode is disposed between the power supply and the power supply control unit. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some exemplary embodiments of this disclosure. For those skilled in the art, other embodiments can be obtained based on these embodiments without creative effort.

[0015] Figure 1 A schematic circuit diagram of a power supply control device according to an embodiment of the present disclosure is shown.

[0016] Figure 2 A schematic circuit diagram of a power supply control device according to another embodiment of the present disclosure is shown.

[0017] Figure 3 A schematic circuit diagram of a power supply control device according to another embodiment of the present disclosure is shown, and

[0018] Figure 4 A schematic circuit diagram of a power supply control device according to another embodiment of the present disclosure is shown. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this disclosure more apparent, exemplary embodiments according to this disclosure will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this disclosure, and not all embodiments of this disclosure. It should be understood that this disclosure is not limited to the exemplary embodiments described herein.

[0020] In this specification and accompanying drawings, substantially the same or similar method steps and elements are indicated by the same or similar reference numerals, and repeated descriptions of these method steps and elements will be omitted. Furthermore, in the description of this disclosure, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance or order. In embodiments of this disclosure, unless otherwise expressly stated, "connection" does not necessarily mean "direct connection" or "direct contact," but only requires electrical connection.

[0021] Vehicles contain numerous sensors. The vehicle's control unit communicates with these sensors to control them and acquire data from them. Furthermore, the control unit also controls the power supply to the sensors. The vehicle's control unit can be, for example, a central controller, a microcontroller (MCU), a domain controller (DCU), or an electronic control unit (ECU). The power supply control of other components, such as sensors, by the vehicle's control unit is achieved through a power supply control device.

[0022] This disclosure provides a power supply control device in which the output voltage Vout, i.e., the power supply Vcc to the load, can be controlled by an enable signal Venable. Figure 1 A schematic diagram of a power supply control device 100 according to the present disclosure is shown. The power supply control device 100 includes a power supply control unit 110 and a drive unit 120. The power supply control unit 110 includes a power supply control switch Q1, a first voltage divider resistor R1, and a second voltage divider resistor R2. The power supply Vcc is connected to the power supply output terminal through the first voltage divider resistor R1, and the power supply output terminal is connected to a reference potential point through the second voltage divider resistor R2, which is grounded in this disclosure; however, it can also be set to other reference potential points. The power supply control switch Q1 is connected in parallel with the first voltage divider resistor R1.

[0023] The drive unit 120 is used to drive the power supply control switch Q1 to turn on and off. When the power supply control switch Q1 is off, the power supply output terminal outputs a first power supply voltage, and the output voltage Vout of the power supply output terminal depends on the voltage division between the first voltage divider resistor R1 and the second voltage divider resistor R2, i.e., Vcc*R2(R1+R2). When the power supply control switch Q2 is on, the power supply output terminal outputs a second power supply voltage, such as Vcc, wherein the second power supply voltage is greater than the first power supply voltage.

[0024] In embodiments of this disclosure, the output voltage Vout at the power supply output terminal also depends on the load. With the power supply control switch Q1 open, for no load or with the load disconnected, the output voltage Vout is equal to the voltage across the second voltage divider resistor R2. If the first voltage divider resistor R1 is equal to the second voltage divider resistor R2, the output voltage Vout is equal to Vcc / 2. For a normally connected load, since the load impedance is much smaller than the voltage divider resistors R1 or R2, the output voltage Vout is approximately 0V. For a load short-circuited to ground, the output voltage Vout is approximately 0V.

[0025] With power control switch Q1 on, the output voltage Vout equals Vcc when there is no load or the load is disconnected. When the load is normally connected, the output voltage Vout is approximately equal to Vcc (considering the on-state voltage drop of power control switch Q1 and the possible current-limiting resistor R5, the output voltage Vout is less than Vcc). When the load is short-circuited to ground, the output voltage Vout is approximately 0V.

[0026] In embodiments according to this disclosure, the drive unit 120 may include, for example, a drive switch Q2, a first bias element, and a second bias element. Figure 1 In the illustrated embodiment, the first bias element and the second bias element are configured as resistors R3 and R4, respectively. The power supply control switch Q1 and the drive switch Q2 can be configured as electronic switches, such as transistors. In embodiments of this disclosure, the power supply control switch Q1 can be configured as a PNP transistor, and the drive switch Q2 can be configured as an NPN transistor. The first bias resistor R3 is arranged between the emitter and control (base) of the power supply control switch Q1. A series circuit consisting of the second bias element R4 and the drive switch Q2 is arranged between the control (base) of the power supply control switch Q1 and the reference potential point. The power supply control switch Q1 is controlled by turning the drive switch Q2 on and off. The turning on and off of the drive switch Q2 is controlled by an enable signal Venable applied to the control (base) of the drive switch Q2. The enable signal Venable can be issued, for example, by a central controller, domain controller, or electronic controller.

[0027] In another embodiment, the power supply control switch Q1 and the drive switch Q2 can be configured as other electronic switches, such as MOSFETs and IGBTs. A first bias resistor R3 is arranged between the drain and the control electrode (gate) of the power supply control switch Q1. A series circuit consisting of a second bias element R4 and the drive switch Q2 is arranged between the control electrode (gate) of the power supply control switch Q1 and ground.

[0028] The switching on and off of drive switch Q2 is controlled by an enable signal Venable applied to the control electrode of drive switch Q2. When the enable signal Venable is absent, drive switch Q2 is off, there is no voltage across the first bias resistor R3, and power supply control switch Q1 is off. When the enable signal Venable is present, drive switch Q2 is on, there is a voltage drop across the first bias resistor R3, and the voltage U between the emitter (or drain) and control electrode (base) of power supply control switch Q1 is... EB When the voltage is greater than the conduction voltage, the power supply control switch Q1 is turned on.

[0029] In embodiments according to this disclosure, the enable signal Venable may be, for example, a PWM signal. The PWM signal controls the switching on and off of the drive switch Q2, thereby controlling the output voltage Vout or the supply voltage of the load, thus realizing the control of the load power supply using a small signal.

[0030] In an embodiment according to this disclosure, the power supply control unit 110 includes a current-limiting resistor, which in Figures 1 to 4 The current-limiting resistor R5 is shown in the diagram. R5 is connected in series with the power supply control switch Q1 to limit the output current.

[0031] Figure 2 A schematic circuit diagram of a power supply control device 200 according to another embodiment of the present disclosure is shown. In an embodiment according to the present disclosure, the first biasing element may, for example, be configured as at least one diode. Figure 2 In the illustrated embodiment, the first biasing element is constructed as two diodes D2 and D3 connected in series. The second biasing element is still constructed as a resistor R4. When the drive switch Q2 is turned on, the forward voltage drop of the two diodes D2 and D3 connected in series is fixed, for example, 0.7V*2 = 1.4V. The voltage U between the emitter and base of the power supply control switch Q1 is... EB The voltage is limited to 1.4V. Therefore, the current flowing through the power supply control switch Q1 is I = (U EB -0.7V) / R5, where 0.7V is the voltage drop across the emitter junction of the power supply control switch Q1. This design allows for constant current output at the power supply output terminal when the drive switch Q2 is turned on.

[0032] Figure 3 A schematic circuit diagram of a power supply control device 300 according to another embodiment of the present disclosure is shown. Relative to Figure 1The power supply control device 100 shown, and the power supply control device 300, additionally include a third voltage divider resistor R6. Therefore, the power supply output terminal is connected to the reference potential point via the second voltage divider resistor R2 and the third voltage divider resistor R6. A power supply voltage detection terminal is formed between the second voltage divider resistor R2 and the third voltage divider resistor R6. The output voltage (detection voltage) Vdet of the power supply voltage detection terminal is proportional to the output voltage Vout of the power supply output terminal, i.e., Vdet = Vout * R6 / (R2 + R6). By setting the size and ratio of the second voltage divider resistor R2 and the third voltage divider resistor R6, the detection voltage Vdet can be much smaller than the output voltage Vout. By detecting a small detection voltage Vdet, the output voltage Vout of the power supply output terminal can be monitored. The detection voltage Vdet can be fed back to a central controller, domain controller, or electronic controller that issues an enable signal Venable. These controllers can adjust the output voltage Vout based on the feedback signal, for example, in a PWM manner.

[0033] As mentioned earlier, the output voltage Vout at the power supply output terminal depends on both the switching state of the power supply control switch Q1 and the load condition. Therefore, the load condition can be determined based on the output voltage Vout or the sensed voltage Vdet, which includes: normally connected, disconnected (open circuit), and short circuit. The relationship between the output voltage Vout or sensed voltage Vdet and the load condition is shown in the following table:

[0034]

[0035]

[0036] Figure 4 A schematic circuit diagram of a power supply control device 400 according to another embodiment of the present disclosure is shown. Figure 4 The power supply control device 400 shown is a preferred embodiment of this disclosure. Relative to Figure 3 In the embodiment shown, the power supply control device 400 also includes additional components. These components can be implemented individually or in combination with each other.

[0037] exist Figure 4 In the illustrated embodiment, the power supply control device 400 may further include a reverse polarity protection diode D1. The reverse polarity protection diode D1 is disposed between the power supply Vcc and the power supply control unit 110 to limit the current direction.

[0038] In this embodiment, a filter capacitor C1 can also be arranged at the power supply voltage detection terminal. The filter capacitor C1 is arranged between the power supply voltage detection terminal and ground, and can be used to filter out high-frequency noise.

[0039] In this embodiment, a voltage clamping diode can also be arranged at the power supply voltage detection terminal. For example... Figure 4 As shown, voltage clamping diodes D2 and D3 are arranged. Voltage clamping diode D2 is placed between the power supply Vcc and the power supply voltage detection terminal, and voltage clamping diode D3 is placed between the power supply voltage detection terminal and ground. When an excessively large positive or negative voltage occurs at the power supply voltage detection terminal, this excessive voltage can cause voltage clamping diodes D2 or D3 to conduct, thereby preventing the excessive voltage from affecting or damaging the power supply voltage detection terminal.

[0040] The block diagrams of circuits, units, devices, apparatuses, devices, and systems disclosed herein are merely illustrative examples and are not intended to require or imply that connections, arrangements, or configurations must be made in the manner shown in the block diagrams. As those skilled in the art will recognize, these circuits, units, devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner that achieves the desired purpose. The circuits, units, devices, and apparatuses disclosed herein can be implemented in any suitable manner, such as using application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or using general-purpose processors in conjunction with programs.

[0041] Those skilled in the art should understand that the specific embodiments described above are merely examples and not limitations. Various modifications, combinations, partial combinations, and substitutions can be made to the embodiments of this disclosure according to design requirements and other factors, as long as they are within the scope of the appended claims or their equivalents, and thus fall within the scope of the rights to be protected by this disclosure.

Claims

1. A power supply control device, comprising: The power supply control unit includes a power supply control switch, a first voltage divider resistor, and a second voltage divider resistor; A drive unit is used to drive the power supply control switch to be turned on and off; The power supply is connected to the power output terminal through the first voltage divider resistor, and the power output terminal is connected to the reference potential point through the second voltage divider resistor. The power supply control switch is connected in parallel with the first voltage divider resistor. Specifically, when the power supply control switch is off, the power supply output terminal outputs a first power supply voltage; when the power supply control switch is on, the power supply output terminal outputs a second power supply voltage, wherein the second power supply voltage is greater than the first power supply voltage.

2. The power supply control device according to claim 1, in, The driving unit includes a driving switch, a first bias element, and a second bias element. The power supply control switch and the driving switch are configured as electronic switches. The first bias element is arranged between the emitter or drain of the power supply control switch and its control electrode. The series circuit consisting of the second bias element and the driving switch is arranged between the control electrode of the power supply control switch and the reference potential point. The power supply control switch is controlled by turning the drive switch on and off.

3. The power supply control device according to claim 2, in, The power supply control switch is configured as a PNP transistor, and the drive switch is configured as an NPN transistor. Specifically, the disconnection of the drive switch causes the power supply control switch to disconnect, and the connection of the drive switch causes the power supply control switch to connect.

4. The power supply control device according to claim 2, in, The first bias element and the second bias element are configured as resistors.

5. The power supply control device according to claim 2, in, The first biasing element is configured as at least one diode to achieve constant current output when the power supply control switch is turned on, and the second biasing element is configured as a resistor.

6. The power supply control device according to claim 1, in, The power supply control unit also includes a current-limiting resistor, which is connected in series with the power supply control switch.

7. The power supply control device according to claim 1, in, The power supply control unit also includes a third voltage divider resistor, and The power supply output terminal is connected to the reference potential point through the second voltage divider resistor and the third voltage divider resistor, and a power supply voltage detection terminal is formed between the second voltage divider resistor and the third voltage divider resistor.

8. The power supply control device according to claim 7, in, A filter capacitor is arranged at the power supply voltage detection terminal.

9. The power supply control device according to claim 7, in, A voltage clamping diode is arranged at the power supply voltage detection terminal.

10. The power supply control device according to claim 1, further comprising a reverse polarity protection diode, wherein, The reverse polarity protection diode is arranged between the power supply and the power supply control unit.

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