Power supply processing circuit and device and automobile electronic system

Abstract

The invention discloses a power supply processing circuit and device and an automobile electronic system, and relates to the technical field of automobile power supply circuits, and the power supply processing circuit comprises a source electrode following unit, a voltage stabilizing unit, a switch unit and a controller. The source electrode following unit is connected with the power supply and the power supply chip; the voltage stabilizing unit is connected with the source electrode following unit; the switch unit is connected with the voltage stabilizing unit and a grounding end; the controller is connected with the switch unit and is configured as follows: when the power supply chip is in a normal working mode, the controller controls the switch unit to be switched on, so that the power supply, the voltage stabilizing unit and the grounding end form a loop; and when the power supply chip is in a sleep working mode, the controller controls the switch unit to be switched off. When the power supply chip is in a normal working mode, the power supply chip can be ensured to work within a safe voltage range; when the power supply chip is in a sleep working mode, quiescent current consumption of the whole power supply processing circuit can be effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of power circuits, and in particular to a power processing circuit, a device and an automotive electronic system. Background Art

[0002] The cost of linear voltage regulator power supply chip (LDO) is lower than that of DC / DC converter chip, and the peripheral circuit design is relatively simple and there are fewer electromagnetic interference (EMI) problems. Therefore, it has been widely used in automotive electronic circuits with small current demand. However, LDO power supply chips usually have a lower input voltage range, and their withstand voltage level is about 36 to 40V. The power supply voltage on the input side of the LDO power supply chip is usually higher than 40V, such as a 48V car battery. LDO power supply chips are difficult to use in high-voltage environments for a long time.

[0003] In the prior art, a cost-effective solution is to use a source follower circuit and a voltage regulator circuit to reduce the voltage, which effectively solves the above problem by reducing the voltage in stages. However, in some scenarios, such as when the power chip enters sleep mode, the quiescent current requirements are very strict (such as the quiescent current must be less than 0.7mA). However, the current consumption in the voltage regulator circuit may cause the quiescent current to exceed the standard and fail to meet these stringent requirements. Summary of the invention

[0004] The embodiments of the present invention provide a power processing circuit, a device and an automotive electronic system to solve the technical problem in the related art that the existing circuit processing circuit ensures that the input voltage of the power chip is within a safe voltage range through a voltage stabilizing circuit, but when the power chip enters sleep mode, the current in the voltage stabilizing circuit may cause the static current of the entire circuit to exceed the standard.

[0005] In a first aspect, a power processing circuit is provided, comprising: a source follower unit, a voltage stabilizing unit, a switch unit and a controller;

[0006] The source follower unit is connected to the power supply and the power chip;

[0007] The voltage stabilizing unit is connected to the source follower unit;

[0008] The switch unit is connected to the voltage stabilizing unit and the ground terminal;

[0009] The controller is connected to the switch unit and is configured as follows:

[0010] When the power chip is in a normal working mode, the controller controls the switch unit to be turned on, so that the power supply, the voltage stabilizing unit and the ground terminal form a loop;

[0011] When the power chip is in the sleep mode, the controller controls the switch unit to be disconnected.

[0012] In some embodiments, the source follower unit includes a first resistor and a MOS tube, the first end of the first resistor is connected to a power supply and a drain of the MOS tube, the second end of the first resistor is connected to a gate of the MOS tube, and the source of the MOS tube is connected to a power chip.

[0013] In some embodiments, the voltage stabilizing unit is a voltage stabilizing diode, a cathode of the voltage stabilizing diode is connected to the second end of the first resistor and the gate of the MOS tube, and an anode of the voltage stabilizing diode is connected to the switch unit.

[0014] In some embodiments, the switching unit includes a second resistor, a third resistor and a transistor, the first end of the second resistor is connected to the controller, the second end of the second resistor is connected to the first end of the third resistor and the base of the transistor, the second end of the third resistor is connected to the ground, the collector of the transistor is connected to the positive electrode of the Zener diode, and the emitter of the transistor is connected to the ground.

[0015] In some embodiments, the power processing circuit further includes:

[0016] An anti-reverse unit is connected to the power supply and the source follower unit.

[0017] In some embodiments, the anti-reverse unit is an anti-reverse diode, the positive electrode of the anti-reverse diode is connected to the power supply, and the negative electrode of the anti-reverse diode is connected to the first end of the first resistor and the drain of the MOS tube.

[0018] In some embodiments, the power processing circuit further includes:

[0019] A transient voltage suppression unit is connected to a power supply, the anti-reverse unit and a ground terminal.

[0020] In some embodiments, the transient voltage suppression unit is a transient voltage suppression diode, the cathode of the transient voltage suppression diode is connected to the power supply and the anode of the anti-reverse diode, and the anode of the transient voltage suppression diode is connected to the ground terminal.

[0021] In a second aspect, a power processing device is provided, comprising the aforementioned power processing circuit.

[0022] In a third aspect, an automotive electronic system is provided, comprising the aforementioned power processing device.

[0023] The beneficial effects brought about by the technical solution provided by the present invention include:

[0024] An embodiment of the present invention provides a power processing circuit, a device and an automotive electronic system. The power processing circuit is provided with a source follower unit, a voltage stabilizing unit, a switch unit and a controller. When the power chip is in a normal working mode, the controller controls the switch unit to be turned on, so that the power supply, the voltage stabilizing unit and the ground terminal form a loop, ensuring that the power chip operates within a safe voltage range; when the power chip is in a sleep working mode, the controller controls the switch unit to be turned off, disconnecting the loop between the power supply, the voltage stabilizing unit and the ground terminal, effectively reducing the static current consumption of the entire power processing circuit and meeting the performance requirements of low static current consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0026] Figure 1 A schematic diagram of a power processing circuit provided by an embodiment of the present invention;

[0027] Figure 2 A circuit diagram of a power processing circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] An embodiment of the present invention provides a power processing circuit, which can solve the technical problem that the existing circuit processing circuit ensures that the input voltage of the power chip is within a safe voltage range through a voltage stabilizing circuit, but when the power chip enters sleep mode, the current in the voltage stabilizing circuit may cause the static current of the entire circuit to exceed the standard.

[0030] See also Figure 1 As shown, an embodiment of the present invention provides a power processing circuit, which includes: a source follower unit, a voltage stabilizing unit, a switch unit and a controller.

[0031] The source follower unit is connected to a power supply and a power chip, the voltage stabilizing unit is connected to the source follower unit, and the switch unit is connected to the voltage stabilizing unit and a ground terminal.

[0032] The controller is connected to the switch unit and is configured as follows: when the power chip is in a normal working mode, the controller controls the switch unit to be turned on so that the power supply, the voltage stabilizing unit and the ground terminal form a loop; when the power chip is in a sleep working mode, the controller controls the switch unit to be turned off.

[0033] Specifically, see Figure 2 As shown, the source follower unit includes a first resistor R1 and a MOS tube Q1, the first end of the first resistor R1 is connected to the power supply V-BATT and the drain of the MOS tube Q1, the second end of the first resistor R1 is connected to the gate of the MOS tube Q1, and the source of the MOS tube Q1 is connected to the power chip. Figure 2 In the embodiment, the internal resistance of the power chip is RL, a first end of the internal resistance RL is connected to the source of the MOS tube Q1, and a second end of the internal resistance RL is connected to the ground.

[0034] The voltage stabilizing unit is a voltage stabilizing diode ZD, a cathode of the voltage stabilizing diode ZD is connected to the second end of the first resistor R1 and the gate of the MOS tube Q1, and an anode of the voltage stabilizing diode ZD is connected to the switch unit.

[0035] The switch unit includes a second resistor R2, a third resistor R3 and a transistor Q2, the first end of the second resistor R2 is connected to the controller, the second end of the second resistor R2 is connected to the first end of the third resistor R3 and the base of the transistor Q2, the second end of the third resistor R3 is connected to the ground, the collector of the transistor Q2 is connected to the positive electrode of the voltage regulator diode ZD, and the emitter of the transistor Q2 is connected to the ground.

[0036] In the source follower configuration, the MOS transistor Q1 always operates in the variable resistance region, and the source voltage of the MOS transistor Q1 (the voltage provided to the internal resistor RL) is the gate voltage of the MOS transistor Q1 minus a Vgs voltage (usually about 1.5V).

[0037] When the power chip is in normal working mode, the controller turns on the transistor Q2 through a control signal (high level), and the power supply V-BATT is connected to the ground terminal through the first resistor R1, the voltage stabilizing diode ZD and the transistor Q2. The gate voltage of the MOS tube Q1 is clamped at the voltage stabilizing value of the voltage stabilizing diode ZD. Assuming that the voltage stabilizing value of the voltage stabilizing diode ZD is 20V: When the power supply V-BATT is 58V input, the gate voltage value of the MOS tube Q1 is limited to When the power supply V-BATT is 24V, the gate voltage of the MOS tube Q1 is limited to 20V, and the source voltage of the MOS tube Q1 is 18.5V; when the power supply V-BATT is 16V, the Zener diode ZD is cut off because the turn-on voltage of the Zener diode ZD is not reached, the gate voltage of the MOS tube Q1 is 16V, and the source voltage of the MOS tube Q1 is limited to 14.5V.

[0038] In addition, when the power chip is in sleep mode, the controller controls the switch unit to disconnect, the power supply, the Zener diode ZD and the ground terminal do not form a loop, and almost no current flows through the first resistor R1 and the Zener diode ZD, effectively reducing the static current consumption of the entire power processing circuit, so that it can meet the stringent requirement of a static current of less than 0.7mA.

[0039] In addition, the MOS tube Q1 bears part of the voltage difference Uδ and handles this part of the power loss through its own heat dissipation. The heat dissipation power is Uδ*Id, where Id is the current required by the power chip, and the maximum is usually 100mA. In industrial practice, the heat generated by the MOS tube Q1 can be achieved through effective thermal design to achieve the heat balance of the MOS tube Q1 itself.

[0040] The power processing circuit in the implementation of the present invention is provided with a source follower unit, a voltage stabilizing unit, a switch unit and a controller. When the power chip is in a normal working mode, the controller controls the switch unit to be turned on, so that the power supply, the voltage stabilizing unit and the ground terminal form a loop, ensuring that the power chip operates within a safe voltage range; when the power chip is in a sleep working mode, the controller controls the switch unit to be disconnected, disconnecting the loop between the power supply, the voltage stabilizing unit and the ground terminal, effectively reducing the static current consumption of the entire power processing circuit and meeting the performance requirements of low static current consumption.

[0041] As an optional implementation, in an embodiment of the invention, see Figure 2As shown, the power processing circuit further includes: an anti-reverse unit, which is connected to the power supply and the source follower unit. Optionally, the anti-reverse unit is an anti-reverse diode D1, the positive electrode of the anti-reverse diode D1 is connected to the power supply, and the negative electrode of the anti-reverse diode D1 is connected to the first end of the first resistor R1 and the drain of the MOS tube Q1. The anti-reverse unit D1 can prevent reverse current from appearing at the input end of the power supply, protecting the circuit from damage by reverse voltage.

[0042] As an optional implementation, in an embodiment of the invention, see Figure 2 As shown, the power processing circuit also includes: a transient voltage suppression unit, which is connected to the power supply, the anti-reverse unit and the ground terminal. Optionally, the transient voltage suppression unit is a transient voltage suppression diode TVS, the cathode of which is connected to the power supply and the anode of the anti-reverse diode D1, and the anode of which is connected to the ground terminal. When the input voltage of the power supply exceeds a predetermined threshold (such as 58V), the transient voltage suppression diode TVS will enter a low-resistance state and release surge energy in the form of heat dissipation, thereby protecting subsequent circuits from damage. The voltage after peak clipping by the transient voltage suppression diode TVS will be further fed into the subsequent circuit.

[0043] An embodiment of the present invention further provides a power processing device, including the aforementioned power processing circuit, wherein the power processing circuit includes: a source follower unit, a voltage stabilizing unit, a switch unit and a controller.

[0044] The source follower unit is connected to a power supply and a power chip, the voltage stabilizing unit is connected to the source follower unit, and the switch unit is connected to the voltage stabilizing unit and a ground terminal.

[0045] The controller is connected to the switch unit and is configured as follows: when the power chip is in a normal working mode, the controller controls the switch unit to be turned on so that the power supply, the voltage stabilizing unit and the ground terminal form a loop; when the power chip is in a sleep working mode, the controller controls the switch unit to be turned off.

[0046] Specifically, see Figure 2 As shown, the source follower unit includes a first resistor R1 and a MOS tube Q1, the first end of the first resistor R1 is connected to the power supply V-BATT and the drain of the MOS tube Q1, the second end of the first resistor R1 is connected to the gate of the MOS tube Q1, and the source of the MOS tube Q1 is connected to the power chip. Figure 2 In the embodiment, the internal resistance of the power chip is RL, a first end of the internal resistance RL is connected to the source of the MOS tube Q1, and a second end of the internal resistance RL is connected to the ground.

[0047] The voltage stabilizing unit is a voltage stabilizing diode ZD, a cathode of the voltage stabilizing diode ZD is connected to the second end of the first resistor R1 and the gate of the MOS tube Q1, and an anode of the voltage stabilizing diode ZD is connected to the switch unit.

[0048] The switch unit includes a second resistor R2, a third resistor R3 and a transistor Q2, the first end of the second resistor R2 is connected to the controller, the second end of the second resistor R2 is connected to the first end of the third resistor R3 and the base of the transistor Q2, the second end of the third resistor R3 is connected to the ground, the collector of the transistor Q2 is connected to the positive electrode of the voltage regulator diode ZD, and the emitter of the transistor Q2 is connected to the ground.

[0049] In the source follower configuration, the MOS transistor Q1 always operates in the variable resistance region, and the source voltage of the MOS transistor Q1 (the voltage provided to the internal resistor RL) is the gate voltage of the MOS transistor Q1 minus a Vgs voltage (usually about 1.5V).

[0050] When the power chip is in normal working mode, the controller turns on the transistor Q2 through a control signal (high level), and the power supply V-BATT is connected to the ground terminal through the first resistor R1, the voltage stabilizing diode ZD and the transistor Q2. The gate voltage of the MOS tube Q1 is clamped at the voltage stabilizing value of the voltage stabilizing diode ZD. Assuming that the voltage stabilizing value of the voltage stabilizing diode ZD is 20V: When the power supply V-BATT is 58V input, the gate voltage value of the MOS tube Q1 is limited to When the power supply V-BATT is 24V, the gate voltage of the MOS tube Q1 is limited to 20V, and the source voltage of the MOS tube Q1 is 18.5V; when the power supply V-BATT is 16V, the Zener diode ZD is cut off because the turn-on voltage of the Zener diode ZD is not reached, the gate voltage of the MOS tube Q1 is 16V, and the source voltage of the MOS tube Q1 is limited to 14.5V.

[0051] In addition, when the power chip is in sleep mode, the controller controls the switch unit to disconnect, the power supply, the Zener diode ZD and the ground terminal do not form a loop, and almost no current flows through the first resistor R1 and the Zener diode ZD, effectively reducing the static current consumption of the entire power processing circuit, so that it can meet the stringent requirement of a static current of less than 0.7mA.

[0052] In addition, the MOS tube Q1 bears part of the voltage difference Uδ and handles this part of the power loss through its own heat dissipation. The heat dissipation power is Uδ*Id, where Id is the current required by the power chip, and the maximum is usually 100mA. In industrial practice, the heat generated by the MOS tube Q1 can be achieved through effective thermal design to achieve the heat balance of the MOS tube Q1 itself.

[0053] The power processing device in the implementation of the present invention has a power processing circuit provided with a source follower unit, a voltage stabilizing unit, a switch unit and a controller. When the power chip is in a normal working mode, the controller controls the switch unit to be turned on, so that the power supply, the voltage stabilizing unit and the ground terminal form a loop, thereby ensuring that the power chip operates within a safe voltage range; when the power chip is in a sleep working mode, the controller controls the switch unit to be turned off, thereby disconnecting the loop between the power supply, the voltage stabilizing unit and the ground terminal, thereby effectively reducing the static current consumption of the entire power processing circuit and meeting the performance requirements of low static current consumption.

[0054] As an optional implementation, in an embodiment of the invention, see Figure 2 As shown, the power processing circuit further includes: an anti-reverse unit, which is connected to the power supply and the source follower unit. Optionally, the anti-reverse unit is an anti-reverse diode D1, the positive electrode of the anti-reverse diode D1 is connected to the power supply, and the negative electrode of the anti-reverse diode D1 is connected to the first end of the first resistor R1 and the drain of the MOS tube Q1. The anti-reverse unit D1 can prevent reverse current from appearing at the input end of the power supply, protecting the circuit from damage by reverse voltage.

[0055] As an optional implementation, in an embodiment of the invention, see Figure 2 As shown, the power processing circuit also includes: a transient voltage suppression unit, which is connected to the power supply, the anti-reverse unit and the ground terminal. Optionally, the transient voltage suppression unit is a transient voltage suppression diode TVS, the cathode of which is connected to the power supply and the anode of the anti-reverse diode D1, and the anode of which is connected to the ground terminal. When the input voltage of the power supply exceeds a predetermined threshold (such as 58V), the transient voltage suppression diode TVS will enter a low-resistance state and release surge energy in the form of heat dissipation, thereby protecting subsequent circuits from damage. The voltage after peak clipping by the transient voltage suppression diode TVS will be further fed into the subsequent circuit.

[0056] An embodiment of the present invention further provides an automotive electronic system, comprising the aforementioned power processing device.

[0057] In the description of the present invention, it should be noted that the terms "upper", "lower", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0058] It should be noted that, in the present invention, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0059] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features of the present invention.

Claims

1. A power processing circuit, characterized in that: include: A source follower unit, a voltage stabilizing unit, a switch unit and a controller; The source follower unit is connected to the power supply and the power chip; The voltage stabilizing unit is connected to the source follower unit; The switch unit is connected to the voltage stabilizing unit and the ground terminal; The controller is connected to the switch unit and is configured as follows: When the power chip is in a normal working mode, the controller controls the switch unit to be turned on, so that the power supply, the voltage stabilizing unit and the ground terminal form a loop; When the power chip is in the sleep mode, the controller controls the switch unit to be disconnected.

2. The power processing circuit according to claim 1, characterized in that: The source follower unit includes a first resistor and a MOS tube, wherein a first end of the first resistor is connected to a power supply and a drain of the MOS tube, a second end of the first resistor is connected to a gate of the MOS tube, and a source of the MOS tube is connected to a power chip.

3. The power processing circuit according to claim 2, characterized in that: The voltage stabilizing unit is a voltage stabilizing diode, a cathode of the voltage stabilizing diode is connected to the second end of the first resistor and the gate of the MOS tube, and an anode of the voltage stabilizing diode is connected to the switch unit.

4. The power processing circuit according to claim 3, characterized in that: The switch unit includes a second resistor, a third resistor and a transistor, the first end of the second resistor is connected to the controller, the second end of the second resistor is connected to the first end of the third resistor and the base of the transistor, the second end of the third resistor is connected to the ground, the collector of the transistor is connected to the positive electrode of the Zener diode, and the emitter of the transistor is connected to the ground.

5. The power processing circuit according to claim 2, characterized in that: The power processing circuit also includes: An anti-reverse unit is connected to the power supply and the source follower unit.

6. The power processing circuit according to claim 5, characterized in that: The anti-reverse unit is an anti-reverse diode, the positive electrode of the anti-reverse diode is connected to the power supply, and the negative electrode of the anti-reverse diode is connected to the first end of the first resistor and the drain of the MOS tube.

7. The power processing circuit according to claim 6, characterized in that: The power processing circuit also includes: A transient voltage suppression unit is connected to a power supply, the anti-reverse unit and a ground terminal.

8. The power processing circuit according to claim 7, characterized in that: The transient voltage suppression unit is a transient voltage suppression diode, the cathode of the transient voltage suppression diode is connected to the power supply and the anode of the anti-reverse diode, and the anode of the transient voltage suppression diode is connected to the ground terminal.

9. A power processing device, characterized in that: The invention comprises the power processing circuit as claimed in any one of claims 1 to 8.

10. An automotive electronic system, characterized in that: Includes the power processing device as claimed in claim 9.

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