A fast discharge circuit for domain controller voltage bleeder
By designing a fast discharge circuit for the primary enable unit, primary discharge unit, and secondary discharge unit, the problem of residual voltage affecting startup after power-down of the domain controller chip was solved, achieving a fast discharge effect with low cost and low power consumption.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEBEI ECO EV TECH CO LTD
- Filing Date
- 2025-06-30
- Publication Date
- 2026-07-03
AI Technical Summary
The domain controller chip has residual voltage after power-down, which affects the normal startup of the chip.
A fast discharge circuit consisting of a primary enable unit, a primary discharge unit, and a secondary discharge unit was designed. It is built using discrete components and uses a discharge resistor to discharge residual voltage.
It enables rapid discharge of residual voltage after chip power-off, reducing circuit cost and power consumption, and meeting the rapid discharge requirements of domain controllers.
Smart Images
Figure CN224459249U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of electronic power supply technology, and in particular relates to a fast discharge circuit for voltage discharge of domain controllers. Background Technology
[0002] With the rapid development of the electronics industry, domain controllers are highly relevant to the intelligentization, connectivity, and electrification of automobiles. A constant stream of high-performance automotive-grade SoC chips provides reliable hardware support for domain controllers. As the functions of SoC chips become increasingly complex, and with power supply voltages decreasing, the voltage requirements for these chips are becoming more stringent.
[0003] Almost all SOC chips used in domain controllers on the market have requirements for residual voltage in the circuit. However, after the chip is powered off, there is still a certain residual voltage in the circuit. If it is not discharged quickly, it may affect the next startup of the chip, and thus affect the normal operation of the domain controller. Utility Model Content
[0004] In view of this, this application aims to propose a fast discharge circuit for voltage bleed-out of a domain controller, in order to solve the problem that after the chip is powered off, the circuit still has a certain residual voltage, which affects the next startup of the chip.
[0005] To achieve the above objectives, the technical solution of this application is implemented as follows:
[0006] This application provides a fast discharge circuit for voltage bleeding of a domain controller, including a primary enable unit, a primary discharge unit, and a secondary discharge unit connected in series.
[0007] The primary enabling unit consists of two primary enabling branches. One end of each primary enabling branch is configured as an enabling terminal to receive an enabling signal, and the other end is configured to generate a discharge signal for the primary discharge unit and the secondary discharge unit.
[0008] The primary discharge unit and the secondary discharge unit are connected to an external load and are configured to discharge residual voltage through the connected discharge resistor.
[0009] Furthermore, the primary enabling unit includes a first primary enabling branch and a second primary enabling branch;
[0010] The first primary enable branch includes a first switch transistor. The first end of the first switch transistor is connected to a first voltage divider resistor. The first voltage divider resistor is composed of a fifth resistor and a sixth resistor. The other end of the fifth resistor serves as the enable terminal. The sixth resistor is connected to the second end of the first switch transistor and grounded.
[0011] The third terminal of the first switching transistor is connected to the first resistor, and the other end of the first resistor serves as the primary power supply terminal.
[0012] Furthermore, the second primary enable branch includes a fourth switch transistor, the first end of which is connected to a second voltage divider resistor, the second voltage divider resistor being composed of a tenth resistor and an eleventh resistor, the other end of which serves as an enable terminal, and the eleventh resistor being connected to the second end of the fourth switch transistor and grounded.
[0013] Furthermore, the primary discharge unit includes a third switch transistor, the first end of which is connected to the eighth resistor, the ninth resistor, and the third end of the fourth switch transistor, respectively. The other end of the eighth resistor serves as the primary power supply terminal, and the other end of the ninth resistor is grounded.
[0014] The second terminal of the third switching transistor is sequentially connected to the third resistor and the first diode, and the anode of the first diode is connected to the primary power supply terminal.
[0015] The third terminal of the third switch is grounded.
[0016] Furthermore, the third switching transistor is an NPN transistor, the base of which is connected to the eighth resistor, the ninth resistor, and the third terminal of the fourth switching transistor, the collector of which is connected to the third resistor, and the emitter of which is grounded.
[0017] Furthermore, the secondary discharge unit includes a second switching transistor, the first end of which is connected to a third voltage divider resistor, the third voltage divider resistor being composed of a fourth resistor and a seventh resistor, the other end of which is connected to the third end of the first switching transistor, and the seventh resistor being connected to the second end of the second switching transistor and grounded;
[0018] The third terminal of the second switching transistor is connected to the second resistor, which serves as the secondary power supply terminal.
[0019] A twelfth resistor and a second diode are connected in parallel between the second terminal and the third terminal of the second switching transistor.
[0020] Furthermore, the first switch and the second switch are NMOS transistors.
[0021] Furthermore, the second diode is a bidirectional trigger diode.
[0022] Compared with the prior art, the fast discharge circuit for domain controller voltage bleeding described in this application has the following advantages:
[0023] The fast discharge circuit for voltage bleeding of a domain controller described in this application is built with discrete components and consists of a primary enable unit, a primary discharge unit, and a secondary discharge unit. The circuit is inexpensive, has no operating environment limitations, requires fewer circuit components, and features small size and low power consumption, while meeting the domain controller's requirement for rapid residual voltage bleeding. Attached Figure Description
[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:
[0025] Figure 1 This is a schematic diagram of a fast discharge circuit for voltage bleeding of a domain controller, as described in an embodiment of this application. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.
[0027] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, but does not exclude other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can refer to any connection.
[0028] This includes electrical connections, whether direct or indirect. Terms like "up," "down," "left," and "right" are used only to indicate relative positional relationships; these relative relationships may change if the absolute position of the object being described changes.
[0029] Please see Figure 1 As shown, this embodiment provides a fast discharge circuit for voltage bleeding of a domain controller, including a primary enable unit, a primary discharge unit, and a secondary discharge unit connected in series.
[0030] The primary enable unit consists of two primary enable branches. One end of each primary enable branch is configured as an enable terminal to receive an enable signal, and the other end is configured to generate a discharge signal for the primary discharge unit and the secondary discharge unit.
[0031] The primary discharge unit and the secondary discharge unit are connected to an external load and are configured to discharge residual voltage through the connected discharge resistor.
[0032] The circuit described in this embodiment is built using discrete components and consists of a primary enable unit, a primary discharge unit, and a secondary discharge unit. The circuit is inexpensive, has no limitations on the working environment, requires fewer components, and features small size and low power consumption. It also meets the domain controller's requirement for rapid residual voltage discharge.
[0033] In some implementations, the primary enabling unit includes a first primary enabling branch and a second primary enabling branch.
[0034] The first primary enable branch includes a first switch Q1 (Q1 selected in this embodiment is an N-channel MOS transistor). The first terminal (i.e., the gate) of the first switch Q1 is connected to a first voltage divider resistor, which is composed of a fifth resistor R5 and a sixth resistor R6. The other end of the fifth resistor R5 serves as the enable terminal, and the sixth resistor R6 is connected to the second terminal (i.e., the source) of the first switch Q1 and grounded.
[0035] The third terminal (drain) of the first switching transistor Q1 is connected to the first resistor R1, and the other end of the first resistor R1 serves as the primary power supply terminal;
[0036] The second primary enable branch includes a fourth switch Q4 (Q4 selected in this embodiment is an N-channel MOS transistor). The first terminal (i.e., the gate) of the fourth switch Q4 is connected to a second voltage divider resistor, which is composed of a tenth resistor R10 and an eleventh resistor R11. The other end of the tenth resistor R10 serves as the enable terminal, and the eleventh resistor R11 is connected to the second terminal (i.e., the source) of the fourth switch Q4 and grounded.
[0037] In some implementations, the primary discharge unit includes a third switch Q3 (Q3 selected in this embodiment is an NPN transistor). The first terminal (i.e., the base) of the third switch Q3 is connected to the eighth resistor R8, the ninth resistor R9, and the third terminal (i.e., the drain) of the fourth switch Q4. The other terminal of the eighth resistor R8 serves as the primary power supply terminal VDD_First, and the other terminal of the ninth resistor R9 is grounded.
[0038] The second terminal (i.e., collector) of the third switch Q3 is sequentially connected to the third resistor R3 and the first diode D1 (the first diode D1 selected in this embodiment is a common light-emitting diode). The anode of the first diode D1 is connected to the primary power supply terminal VDD_First.
[0039] The third terminal (i.e. emitter) of the third switch Q3 is grounded.
[0040] In some implementations, the secondary discharge unit includes a second switch Q2 (Q2 selected in this embodiment is an N-channel MOS transistor). The first terminal (i.e., gate) of the second switch Q2 is connected to a third voltage divider resistor, which is composed of a fourth resistor R4 and a seventh resistor R7. The other terminal of the fourth resistor R4 is connected to the third terminal (i.e. drain) of the first switch Q1, and the seventh resistor R7 is connected to the second terminal (i.e. source) of the second switch Q2 and grounded.
[0041] The third terminal of the second switch Q2 is connected to the second resistor R2, and the second resistor R2 serves as the secondary power supply terminal VDD_Second;
[0042] A twelfth resistor R12 and a second diode D2 (the second diode D2 selected in this embodiment is a bidirectional trigger diode) are connected in parallel between the second terminal (i.e., the source) and the third terminal (i.e., the drain) of the second switch Q2.
[0043] How does this circuit work?
[0044] (1) Under normal power-on conditions, the enable signal POWER_EN is pulled high, the MOS transistor Q1 in the primary enable unit is turned on, the Discharge2 signal is low, the MOS transistor Q2 in the secondary discharge unit is not turned on, and the secondary power supply VDD_Second works normally.
[0045] (2) Under normal power-on conditions, the enable signal POWER_EN is pulled high, Discharge1 and MOSFET Q3 cannot be turned on, and VDD_First works normally.
[0046] (3) When the power is off, the POWER_EN signal is pulled low, the MOS transistor Q1 in the primary enable unit is not turned on, the Discharge2 signal is high, the MOS transistor Q2 in the secondary discharge unit is turned on, and the secondary power supply VDD_Second quickly discharges the residual voltage to ground through the discharge resistor R12.
[0047] (4) When the power is off, the POWER_EN signal is pulled low, the MOS transistor Q4 in the primary enable unit is not turned on, the Discharge1 signal is high, the transistor Q3 in the primary discharge unit is turned on, and the primary power supply VDD_First quickly discharges the residual voltage to ground through the discharge resistor R3.
[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.
[0049] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.
Claims
1. A fast discharge circuit for voltage bleed-off of a domain controller, characterized in that: It includes a primary enabling unit, a primary discharging unit, and a secondary discharging unit that are connected to each other; The primary enabling unit consists of two primary enabling branches. One end of each primary enabling branch is configured as an enabling terminal to receive an enabling signal, and the other end is configured to generate a discharge signal for the primary discharge unit and the secondary discharge unit. The primary discharge unit and the secondary discharge unit are connected to an external load and are configured to discharge residual voltage through the connected discharge resistor.
2. The fast discharge circuit for voltage bleeding of a domain controller according to claim 1, characterized in that: The primary enabling unit includes a first primary enabling branch and a second primary enabling branch; The first primary enable branch includes a first switch transistor. The first end of the first switch transistor is connected to a first voltage divider resistor. The first voltage divider resistor is composed of a fifth resistor and a sixth resistor. The other end of the fifth resistor serves as the enable terminal. The sixth resistor is connected to the second end of the first switch transistor and grounded. The third terminal of the first switching transistor is connected to the first resistor, and the other end of the first resistor serves as the primary power supply terminal.
3. The fast discharge circuit for voltage bleeding of a domain controller according to claim 2, characterized in that: The second primary enable branch includes a fourth switch transistor. The first end of the fourth switch transistor is connected to a second voltage divider resistor, which is composed of a tenth resistor and an eleventh resistor. The other end of the tenth resistor serves as the enable terminal, and the eleventh resistor is connected to the second end of the fourth switch transistor and grounded.
4. A fast discharge circuit for voltage bleeding of a domain controller according to claim 3, characterized in that: The primary discharge unit includes a third switch transistor. The first end of the third switch transistor is connected to the eighth resistor, the ninth resistor, and the third end of the fourth switch transistor. The other end of the eighth resistor serves as the primary power supply terminal, and the other end of the ninth resistor is grounded. The second terminal of the third switching transistor is sequentially connected to the third resistor and the first diode, and the anode of the first diode is connected to the primary power supply terminal. The third terminal of the third switch is grounded.
5. A fast discharge circuit for voltage bleeding of a domain controller according to claim 4, characterized in that: The third switching transistor is an NPN transistor. The base of the NPN transistor is connected to the eighth resistor, the ninth resistor, and the third terminal of the fourth switching transistor. The collector of the NPN transistor is connected to the third resistor, and the emitter of the NPN transistor is grounded.
6. A fast discharge circuit for voltage bleeding of a domain controller according to claim 2, characterized in that: The secondary discharge unit includes a second switching transistor. The first end of the second switching transistor is connected to a third voltage divider resistor. The third voltage divider resistor is composed of a fourth resistor and a seventh resistor. The other end of the fourth resistor is connected to the third end of the first switching transistor. The seventh resistor is connected to the second end of the second switching transistor and grounded. The third terminal of the second switching transistor is connected to the second resistor, which serves as the secondary power supply terminal. A twelfth resistor and a second diode are connected in parallel between the second terminal and the third terminal of the second switching transistor.
7. A fast discharge circuit for voltage bleeding of a domain controller according to claim 6, characterized in that: The first switch and the second switch are NMOS transistors.
8. A fast discharge circuit for voltage bleeding of a domain controller according to claim 6, characterized in that: The second diode is a bidirectional trigger diode.