DC power supply conversion module and power supply system

Abstract

The utility model relates to a direct current power supply conversion module and a power supply system, the direct current power supply conversion module comprises a DCDC power supply chip, a slow start unit, a resistive unit and a logic control unit, the slow start unit is used for controlling the on-off of the DCDC power supply chip, and is used for setting a threshold value that a power supply input voltage can start the DCDC power supply chip; the resistive unit is used for adjusting the threshold value; and the logic control unit is used for controlling the resistive unit to intervene and withdraw adjustment on the threshold value according to the signal source. The DC power supply conversion module can adjust the power supply input threshold range for starting the DCDC power supply chip according to the preset condition change, thereby achieving the anti-interference purpose.

Description

Technical Field

[0001] The utility model relates to the technical field of DC - to - DC conversion, in particular to a DC power conversion module and a power supply system. Background Art

[0002] Nowadays, the in - vehicle electronics industry has developed rapidly, and various electronic products with rich functions are applied to vehicles.

[0003] Among them, in - vehicle electronic devices installed on vehicles will bear electrical stresses in a specific environment during normal vehicle operation. For example, when the in - vehicle power supply alternates between multiple electrical loads, an electrical load experiences an accidental short - circuit, or discharges to a dead battery, etc., voltage dips and power supply interruptions and other disturbances will occur in the in - vehicle power supply. At this time, if the relevant anti - interference capabilities of in - vehicle electronic devices are lacking, it will lead to functional failures and potential safety hazards. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a DC power conversion module and a power supply system.

[0005] The technical solution adopted by the utility model to solve its technical problem is to construct a DC power conversion module, which includes a DCDC power chip. The input pin of the DCDC power chip is connected to the power input terminal, and the switch pin of the DCDC power chip is connected to the power output terminal.

[0006] The DC power conversion module further includes:

[0007] A soft - start unit, which is used to control the opening and closing of the DCDC power chip and is used to set the threshold value at which the power input voltage can start the DCDC power chip;

[0008] A resistive unit, which is used to adjust the magnitude of the threshold value;

[0009] A logic control unit, which is used to control the resistive unit to intervene and withdraw from the adjustment of the threshold value according to a signal source;

[0010] The input end of the soft - start unit is connected to the power input terminal, the output end of the soft - start unit is connected to the enable pin of the DCDC power chip, and the soft - start unit is also provided with a connection end, which is connected to the ground terminal by connecting the resistive unit;

[0011] The output end of the logic control unit is connected to the circuit between the connection end of the soft - start unit and the ground terminal, and the control end of the logic control unit is used to be connected to a signal source.

[0012] In some embodiments, the logic control unit includes at least one switching transistor for controlling the on / off of the circuit between the connection end of the soft-start unit (2) and the ground terminal;

[0013] The current input terminal and the current output terminal of the switching transistor are connected to the circuit between the connection end of the soft-start unit and the ground terminal, and the control terminal of the switching transistor is used to connect to a signal source.

[0014] In some embodiments, the logic control unit includes a first switching transistor and a second switching transistor;

[0015] The control terminal of the first switching transistor is used to connect to a signal source, the current input terminal of the first switching transistor is connected to the power input terminal, and the current output terminal of the first switching transistor is connected to the ground terminal; the control terminal of the second switching transistor is connected to the current input terminal of the first switching transistor, and the current input terminal and the current output terminal of the second switching transistor are connected to the circuit between the connection end of the soft-start unit and the ground terminal.

[0016] In some embodiments, the soft-start unit includes a resistor R2 and a resistor R6. One end of the resistor R2 is connected to the power input terminal, and the other end of the resistor R2 is connected to the ground terminal through the resistor R6; the enable pin of the DCDC power chip is connected between the resistor R2 and the resistor R6.

[0017] In some embodiments, the soft-start unit further includes a capacitor C2 for filtering. One end of the capacitor C2 is connected between the resistor R2 and the resistor R6, and the other end of the capacitor C2 is connected to the ground terminal.

[0018] In some embodiments, the resistive unit is connected in series between the resistor R2 and the ground terminal.

[0019] In some embodiments, the DC power conversion module further includes a diode D1. The anode of the diode D1 is connected between the enable pin of the DCDC power chip and the ground terminal, and its cathode is connected between the power input terminal and the input pin of the DCDC power chip to help release the residual charge at the enable pin of the DCDC power chip.

[0020] In some embodiments, the DC power conversion module further includes an energy storage unit for energy storage and energy release. The switching pin of the DCDC power chip is connected to the power output terminal through the energy storage unit.

[0021] The present utility model also constructs a power supply system, including a signal output terminal for outputting a signal source, and including the above-mentioned DC power conversion module.

[0022] In some embodiments, the signal output terminal is used to output a reset signal.

[0023] Implementing the present utility model has the following beneficial effects: This DC power conversion module can adjust the power input threshold range for starting the DCDC power chip according to preset condition changes, so as to achieve the purpose of anti-interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present utility model will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0025] Figure 1 is a logic block diagram of the front-end circuit of the DCDC power chip of the DC power conversion module of the present utility model in some embodiments;

[0026] Figure 2 is a circuit schematic diagram of the DC power conversion module of the present utility model in some embodiments.

[0027] Reference numerals:

[0028] DC power conversion module 100; power input terminal 101; power output terminal 102; DCDC power chip 1; soft start unit 2; logic control unit 3; first switching tube 31; second switching tube 32; resistive unit 4; energy storage unit 5. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] In order to have a clearer understanding of the technical features, objectives, and effects of the present utility model, the specific embodiments of the present utility model will now be described in detail with reference to the drawings. In the following description, it should be understood that the orientation or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are based on the orientation or positional relationships shown in the drawings and are constructed and operated in a specific orientation, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0030] It should also be noted that, unless otherwise clearly specified and defined, terms such as "installation", "connection", "linkage", "fixation", "setting", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. When one component is referred to as "on" or "under" another component, the component can be "directly" or "indirectly" located above the other component, or there may also be one or more intermediate components. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", etc. can explicitly or implicitly include one or more of such features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] In the following description, for the purpose of illustration rather than limitation, specific details such as specific system structures and technologies are proposed to thoroughly understand the embodiments of the present utility model. However, those skilled in the art should clearly understand that the present utility model can also be implemented in other embodiments without these specific details. In other cases, the detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present utility model.

[0032] The present utility model constructs a DC power conversion module 100, which can dynamically adjust the power input voltage range to cope with the power input disturbance problem, has good anti-interference ability, and can still maintain good output when the power input is unstable.

[0033] This DC power conversion module 100 can be applied to the power system of vehicle-mounted equipment to improve the anti-interference ability under low voltage conditions, so as to cope with situations such as power voltage drop or power supply interruption in normal vehicle use environments or test conditions, avoid equipment function or performance abnormalities caused by the above failures, and thus improve the environmental adaptability and quality reliability of the equipment.

[0034] It can be understood that this DC power conversion module 100 can be a buck module or a boost module, which is not limited here. The following takes this DC power conversion module 100 as a buck module as an example for illustration.

[0035] In some embodiments, please refer to Figure 1, this DC power conversion module 100 may include a DC-DC power chip 1, which is used to convert the power input voltage into a power output voltage. The input pin of the DC-DC power chip 1 is connected to the power input terminal 101, and the switch pin of the DC-DC power chip 1 is connected to the power output terminal 102. Understandably, the power input terminal 101 and the power output terminal 102 refer to the power input terminal 101 and the power output terminal 102 of the DC power conversion module 100.

[0036] Continuing as Figure 1 shown, this DC power conversion module 100 further includes a soft-start unit 2, a logic control unit 3, and a resistive unit 4. Among them, the soft-start unit 2 is used to control the start and stop of the DC-DC power chip 1, and is used to set the threshold value at which the power input voltage can start the DC-DC power chip 1. The resistive unit 4 is used to adjust the magnitude of the threshold value of the power input voltage. The logic control unit 3 is used to control the intervention and withdrawal of the resistive unit 4 from adjusting the threshold value of the power input voltage according to the control signal source.

[0037] The soft-start unit 2 includes a first end, a second end, and a third end. The first end of the soft-start unit 2 is the input end, which is connected to the power input terminal 101 to receive the power input voltage; the second end of the soft-start unit 2 is the output end, which is connected to the enable pin of the DC-DC power chip 1 to output the start voltage after being divided by the soft-start unit 2; the third end of the soft-start unit 2 is the connection end, which is connected to the ground terminal through the resistive unit 4.

[0038] The input end of the logic control unit 3 is connected to the power input terminal 101, the output end of the logic control unit 3 is connected to the circuit between the third end of the soft-start unit 2 and the ground terminal, and the control end of the logic control unit 3 is used to be connected to the signal source, that is, for receiving the level signal. The logic control unit 3 can control the on-off of the circuit between the third end of the soft-start unit 2 and the ground terminal according to the level signal, so as to control the intervention and withdrawal of the resistive unit 4 from adjusting the threshold value of the power input voltage.

[0039] Understandably, the DC-DC power chip 1 has a threshold voltage at its enable pin. When the start voltage applied to its enable pin is greater than or equal to the threshold voltage, the DC-DC power chip 1 starts and operates, otherwise the DC-DC power chip 1 is turned off.

[0040] Therefore, only when the power input voltage is greater than or equal to a certain value will the DC-DC power chip 1 start. In this article, this certain value is referred to as the threshold value of the power input voltage.

[0041] In this solution, when the logic control unit 3 controls the circuit between the connection terminal of the soft-start unit 2 and the ground terminal to conduct, the resistive unit 4 is coupled to the enable pin of the DCDC power chip 1 (equivalent to the resistive unit 4 intervening), making the threshold value at a high level; and when the logic control unit 3 controls the circuit between the connection terminal of the soft-start unit 2 and the ground terminal to disconnect, the resistive unit 4 is decoupled from the enable pin of the DCDC power chip 1 (equivalent to the resistive unit 4 withdrawing), making the threshold value at a low level.

[0042] Based on this, when put into application, the power input threshold range for starting the DCDC power chip 1 can be widened / narrowed according to the preset condition changes, so as to achieve the purpose of anti-interference.

[0043] In some embodiments, this DC power conversion module 100 can be applied to the power system of in-vehicle devices. The logic control unit 3 is set to use the reset signal of the power system as the control signal source, and its control terminal is connected to the output terminal for outputting the reset signal in the power system. It receives a high-level signal in the normal working state of the power system and a low-level signal when the power system is reset. Understandably, the power system of in-vehicle devices generally resets when the external reset system works, or when there is an abnormal automatic restart during EMC testing, etc.

[0044] With such a design, when the power system is in the reset state, the threshold value for turning on the DCDC power chip 1 can be set to a high level, meeting the power input range planned by the system. At the same time, it can ensure that the in-vehicle power supply discharges and when it approaches a low power level (such as due to continuous discharge of a rechargeable battery resulting in a discharged state), the DCDC power chip 1 is timely turned off to prevent damage to the in-vehicle power supply. And when the power system is in the normal working state, the threshold value for turning on the DCDC power chip 1 is adjusted to a low level, widening the start-up threshold range of the DCDC power chip 1, so that when there are situations such as power voltage drop or power supply interruption in the power system, the normal turn-on of the DCDC power chip 1 can continue to be maintained, reducing or eliminating the adverse effects brought by power instability.

[0045] In addition, compared with some related technologies, in order to cope with the situations of power voltage drop and power supply interruption, a sufficient number of decoupling capacitors are set at the input and output terminals of the DCDC power chip 1, and even a farad-level large-capacity capacitor energy storage is added to deal with the above situations, resulting in a huge circuit cost. This solution only uses the logic control unit 3 and the resistive unit 4 to achieve anti-interference under low voltage conditions, reducing the material usage and cost of capacitors, and having a cost advantage.

[0046] The following examples illustrate the composition and connection relationships of each unit in this DC power conversion module 100.

[0047] In some embodiments, please refer to Figure 2, the logic control unit 3 may include a first switching transistor 31 and a second switching transistor 32.

[0048] The control terminal of the first switching transistor 31 is used to receive a level signal. The current input terminal of the first switching transistor 31 is connected to the power input terminal 101, and the current output terminal of the first switching transistor 31 is connected to the ground terminal; the control terminal of the second switching transistor 32 is connected to the current input terminal of the first switching transistor 31, and the current input terminal and the current output terminal of the second switching transistor 32 are connected to the circuit between the third terminal of the soft start unit 2 and the ground terminal.

[0049] Understandably, the logic control unit 3 is a reverse logic control unit 3. When the level signal is low, the first switching transistor 31 is turned off, the second switching transistor 32 is turned on, and the signal output by the logic control unit 3 is high; when the level signal is high, the first switching transistor 31 is turned on, the second switching transistor 32 is turned off, and the signal output by the logic control unit 3 is low.

[0050] In some other embodiments, the logic control unit 3 may be a forward logic control unit 3 or may at least include one switching transistor, which can be adjusted according to specific system requirements and functions and will not be specifically limited here.

[0051] Further optionally, as Figure 2 shown, the first switching transistor 31 may be a triode Q1, and the second switching transistor 32 may also be a triode Q2.

[0052] Continuing to refer to Figure 2 , the logic control unit 3 may further include a resistor R1, a resistor R4, and a resistor R5. The resistor R1 is connected in series to the current input terminal of the first switching transistor 31, the resistor R4 is connected in series to the control terminal of the first switching transistor 31, and the resistor R5 is connected in series to the control terminal of the second switching transistor 32 to adjust the current flowing into the first switching transistor 31 and the second switching transistor 32.

[0053] In addition, the logic control unit 3 may further include a resistor R7. One end of the resistor R7 is connected to the control terminal of the first switching transistor 31, and the other end of the resistor R7 is connected to the ground terminal. The resistor R7 can ensure that the first switching transistor 31 is in the cut-off state when there is no input signal, thus avoiding an uncertain state. For example, when the control terminal of the first switching transistor 31 is used to receive the reset signal of the power supply system, it can avoid the uncertain state caused when the power supply system is powered on.

[0054] As Figure 2 shown, the soft start unit 2 may include a resistor R2 and a resistor R6. One end of the resistor R2 is connected to the power input terminal 101, and the other end of the resistor R2 is connected to the ground terminal through the resistor R6; the enable pin of the DCDC power chip 1 is connected between the resistor R2 and the resistor R6.

[0055] Understandably, by adjusting the resistance values of resistor R2 and resistor R6, the magnitude of the input threshold voltage can be adjusted.

[0056] The soft start unit 2 may further include a capacitor C2 for filtering. One end of the capacitor C2 is connected between the resistor R2 and the resistor R6, and the other end of the capacitor C2 is connected to the ground terminal.

[0057] Continue to refer to Figure 2 , the resistive unit 4 is connected in series between the resistor R2 and the ground terminal. In some embodiments, the resistive unit 4 may include at least one resistive element. In this embodiment, the resistive unit 4 may include a resistor R3. One end of the resistor R3 is connected to the end of the resistor R2 for connecting to the resistor R6, and the other end of the resistor R3 is connected to the current input terminal of the first switching transistor 31. The current output terminal of the first switching transistor 31 is connected to the ground terminal.

[0058] In some embodiments, as Figure 2 shown, the DC power conversion module 100 may further include a diode D1. The anode of the diode D1 is connected between the enable pin of the DCDC power chip 1 and the ground terminal, and its cathode is connected between the power input terminal 101 and the input pin of the DCDC power chip 1, for helping the enable pin of the DCDC power chip 1 to release the residual charge in time.

[0059] The DC power conversion module 100 further includes an energy storage unit 5 for energy storage and energy release. Among them, the switching pin of the DCDC power chip 1 is connected to the power output terminal 102 through the energy storage unit 5.

[0060] The following takes the Figure 2 shown DC power conversion module 100 as an example, and calculates the threshold value of the power input voltage in the DC power conversion module 100 by way of enumerating numerical values, so as to illustrate the effect of this DC power conversion module 100.

[0061] Assume that this DC power conversion module 100 is applied to the power system of a vehicle-mounted device, and the control terminal of the logic control unit 3 is set to receive a reset signal issued by the power system.

[0062] Assume further that the power supply range of the DC power conversion module 100 is 9V - 16V, the typical input is 12V, it completes the power conversion of 12V - 5V, the threshold voltage of the enable pin of the DCDC power chip 1 is 1.2V, the resistor R2 is 100KΩ, the resistor R3 is 37.4KΩ, and the resistor R6 = 30KΩ.

[0063] When the power system is reset, the reset signal RESET of the system is at a low level. At this time, the triode Q1 is turned off and the triode Q2 is turned on, and the resistor R3 is involved. At this time, the threshold value of the power input voltage is:

[0064] Vin = 1.2 * {(37.4K ∥ 30K) + 100K} / (37.4 ∥ 30K) = 8.4V

[0065] Understandably, 37.4K ∥ 30K is used to represent the total resistance value of the parallel connection of resistor R3 and resistor R6.

[0066] When the power supply system is working properly, the reset signal RESET of the system is at a high level. At this time, triode Q1 is turned on, triode Q2 is turned off, and resistor R3 is removed. At this time, the threshold value for calculating the power supply input voltage is:

[0067] Vin = 1.2 * (30K + 100K) / 30K = 5.2V

[0068] It can be seen from the above calculated values that when the power supply system is in the reset state of not working, the turn-on threshold value of the DCDC power supply chip 1 is set at 8.4V, which well meets the power supply input range of 9V - 16V defined by the system plan. At the same time, it can ensure that the DCDC power supply chip 1 is turned off in time when the power supply discharges and approaches the low power to prevent damage to the vehicle power supply. When the power supply system is working properly, the turn-on threshold value of the DCDC power supply chip 1 is dynamically adjusted downward to 5.2V, which greatly broadens the power supply input voltage range of the DCDC, so that when there are situations such as power supply voltage drop or power supply interruption in the power supply system, the DCDC power supply chip 1 can continue to maintain normal turn-on, reducing or eliminating the adverse effects brought by power supply instability.

[0069] It can be seen that the DC power conversion module 100 can automatically adjust to a wider power supply input voltage range to cope with power disturbances, improving the anti-interference performance of the system.

[0070] In addition, the present invention also constructs a power supply system, which may include a signal output end for outputting a signal source, and also includes the above-mentioned DC power conversion module 100.

[0071] Optionally, the signal output end is an output end for outputting a reset signal.

[0072] The power supply system may further include a functional circuit connected between the input end of the power supply system and the DC power conversion module 100. The functional circuit may include one or more of an anti-reverse connection protection circuit, a surge protection circuit, a common-mode choke circuit, and a filtering circuit. The input end of the power supply system may be sequentially connected to the anti-reverse connection protection circuit, the surge protection circuit, the common-mode choke circuit, and the filtering circuit, and then connected to the input end of the DC power conversion module 100. The output end of the DC power conversion module 100 is then connected to the output end of the power supply system.

[0073] The reverse connection protection circuit may include a diode, which is used to cope with the power reverse connection test and prevent the device from being damaged by the power reverse connection.

[0074] The surge protection circuit may include a TVS tube, which can effectively suppress the interference of power surges. Understandably, when a power surge enters the power line, the TVS tube will act within a short time to shunt the instantaneous current flowing to the backend circuit, and the backend voltage is limited to the clamping voltage across the TVS tube.

[0075] The common-mode choke circuit may include a common-mode choke coil, which can effectively suppress high-frequency common-mode noise, improve the electromagnetic interference resistance of the power circuit, and at the same time suppress the interference emitted by the circuit itself.

[0076] The filter circuit may be a π-type filter circuit, which can effectively filter out noise and purify the power quality entering the backend circuit.

[0077] It can be understood that the above embodiments only represent the preferred embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be construed as a limitation on the scope of the patent of the present invention; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present invention; therefore, all equivalent transformations and modifications made to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. A direct current power conversion module, comprising a DCDC power chip (1), wherein an input pin of the DCDC power chip (1) is connected to a power input terminal (101), and a switch pin of the DCDC power chip (1) is connected to a power output terminal (102), characterized in that: The DC power conversion module also includes: A soft start unit (2), used for controlling the start and stop of the DCDC power chip (1), and for setting a threshold value at which a power input voltage can start the DCDC power chip (1); A resistive unit (4), used for adjusting the threshold value; A logic control unit (3) for controlling the resistive unit (4) to intervene in and withdraw from adjusting the threshold value according to a signal source; The input end of the slow start unit (2) is connected to the power input end (101), the output end of the slow start unit (2) is connected to the enable pin of the DCDC power chip (1), and the slow start unit (2) is further provided with a connection end, which is connected to the ground end by connecting the resistance unit (4); The output end of the logic control unit (3) is connected to the circuit between the connection end of the slow start unit (2) and the ground end, and the control end of the logic control unit (3) is used to be connected to a signal source.

2. The DC power conversion module according to claim 1, characterized in that: The logic control unit (3) comprises at least one switch tube, which is used to control the on / off of the circuit between the connection end of the slow start unit (2) and the ground end; The current input terminal and the current output terminal of the switch tube are connected to the circuit between the connection terminal of the slow start unit (2) and the ground terminal, and the control terminal of the switch tube is used to be connected to a signal source.

3. The DC power conversion module according to claim 1, characterized in that: The logic control unit (3) comprises a first switch tube (31) and a second switch tube (32); The control end of the first switch tube (31) is used to connect to a signal source, the current input end of the first switch tube (31) is connected to the power input end (101), and the current output end of the first switch tube (31) is connected to the ground end; the control end of the second switch tube (32) is connected to the current input end of the first switch tube (31), and the current input end and the current output end of the second switch tube (32) are connected to the circuit between the connection end of the slow start unit (2) and the ground end.

4. The DC power conversion module according to any one of claims 1 to 3, characterized in that: The slow start unit (2) comprises a resistor R2 and a resistor R6, one end of the resistor R2 is connected to the power input terminal (101), and the other end of the resistor R2 is connected to the ground terminal via the resistor R6; an enable pin of the DCDC power chip (1) is connected between the resistor R2 and the resistor R6.

5. The DC power conversion module according to claim 4, characterized in that: The slow start unit (2) further comprises a capacitor C2 for filtering, one end of the capacitor C2 is connected between the resistor R2 and the resistor R6, and the other end of the capacitor C2 is connected to the ground end.

6. The DC power conversion module according to claim 4, characterized in that: The resistive unit (4) is connected in series between the resistor R2 and the ground terminal.

7. The DC power conversion module according to claim 1, characterized in that: The DC power conversion module further comprises a diode D1, the anode of the diode D1 being connected between the enable pin of the DCDC power chip (1) and the ground terminal, and the cathode of the diode D1 being connected between the power input terminal (101) and the input pin of the DCDC power chip (1), so as to help release residual charge at the enable pin of the DCDC power chip (1).

8. The DC power conversion module according to claim 1, characterized in that: The DC power conversion module further comprises an energy storage unit (5) for storing and releasing energy, and the switch pin of the DCDC power chip (1) is connected to the power output terminal (102) via the energy storage unit (5).

9. A power supply system, comprising a signal output terminal for outputting a signal source, characterized in that: Comprising the DC power conversion module according to any one of claims 1 to 8, the signal output end is connected to the control end of the logic control unit (3).

10. The power supply system according to claim 9, characterized in that: The signal output terminal is an output terminal for outputting a reset signal.

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