Step-down power supply control circuit suitable for vehicle-mounted system

Abstract

The utility model discloses a step-down power supply control circuit suitable for a vehicle-mounted system. The circuit comprises a first control circuit for preventing reverse connection; and the second control circuit or the third control circuit is electrically connected with the first control circuit and is used for realizing voltage reduction power supply of the vehicle-mounted system, power can be directly supplied through a direct-current 24V power supply system and a 12V power supply system, and the power supply systems are not distinguished. That is to say, the buck circuit is adopted in the scheme, so that the circuit cost is low; the vehicle-mounted system is high in universality; compared with the prior art, the 24V charging seat with the control circuit has the advantages that the requirement for a power wire harness is lowered, the wire harness cost of a vehicle-mounted system is reduced, namely, the 24V charging seat with the control circuit can be used regardless of vehicle types, a 24V vehicle-mounted system can be used, a 12V vehicle-mounted system can also be used, and the universality is good.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the vehicle system power supply control technical field, specifically relates to a kind of step-down power supply control circuit suitable for vehicle system. BACKGROUND

[0002] At present, the voltage of truck-mounted generator battery of general truck passenger car is 24V, and the voltage of battery used in car is 12V. The charging base on the market is 12V, which cannot be used in truck and passenger car. In addition, when 24V voltage is stepped down to 5V or 9V, the voltage difference is large, and the circuit conversion efficiency is low.

[0003] Therefore, in view of the above technical problems and defects, such as the charging base on the market is 12V, which cannot be used in truck and passenger car, and when 24V voltage is stepped down to 5V or 9V, the voltage difference is large, and the circuit conversion efficiency is low, it is urgent to design and develop a step-down power supply control circuit suitable for vehicle system. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a step-down power supply control circuit suitable for vehicle system.

[0005] The utility model aims at providing a step-down power supply control circuit suitable for vehicle system.

[0006] Further, the first control circuit is provided with a first MOS tube.

[0007] The collector of the first MOS tube is connected with one end of a second bidirectional TVS tube and the third pin of a first interface respectively; the base of the first MOS tube is connected with one end of a twenty-first resistor and one end of a twenty-second resistor respectively; the emitter of the first MOS tube is connected with the other end of the twenty-first resistor, one end of a fifth capacitor and one end of a first inductor respectively.

[0008] The other end of the first inductor is electrically connected with one end of a sixth capacitor, one end of a second capacitor, one end of a first capacitor, one end of a third capacitor, one end of a fourth capacitor and a second control circuit or a third control circuit respectively.

[0009] The third pin of the first interface, the other end of the second bidirectional TVS tube, the other end of the twenty-second resistor, the other end of the fifth capacitor, the other end of the sixth capacitor, the other end of the second capacitor, the other end of the first capacitor, the other end of the third capacitor and the other end of the fourth capacitor are grounded.

[0010] Further, the model of the second bidirectional TVS tube is SMBJ24CA.

[0011] Further, a second control chip is arranged in the second control circuit.

[0012] The fifth pin of the second control chip is connected with one end of the nineteenth resistor and the negative electrode of the third diode respectively; the other end of the nineteenth resistor is connected with one end of the seventh capacitor; the other end of the seventh capacitor is connected with one end of the second inductor, the tenth pin of the second control chip and the eleventh pin of the second control chip respectively.

[0013] The positive electrode of the third diode is connected with the other end of the second inductor, one end of the twenty-eighth capacitor, one end of the eighth capacitor, one end of the ninth capacitor, one end of the tenth capacitor, one end of the second resistor, one end of the eighth resistor, one end of the sixth bidirectional diode and the first pin of the second interface respectively.

[0014] The other end of the eighth resistor is connected with the fifth pin of the first control chip and one end of the twelfth capacitor respectively; the first pin of the first control chip is connected with one end of the fourth bidirectional diode and the third pin of the second interface respectively.

[0015] The sixth pin of the first control chip is connected with one end of the fifth bidirectional diode and the second pin of the second interface respectively; the third pin of the first control chip is connected with the other end of the second resistor, one end of the sixth resistor and the second pin of the first control chip respectively.

[0016] The other end of the twenty-eighth capacitor, the other end of the eighth capacitor, the other end of the ninth capacitor, the other end of the tenth capacitor, the other end of the fourth bidirectional diode, the other end of the fifth bidirectional diode, the other end of the sixth bidirectional diode, the fourth pin of the first control chip, the other end of the twelfth capacitor, the second pin of the first control chip and the other end of the sixth resistor are grounded.

[0017] Further, the model of the first control chip is FP6601Q.

[0018] Further, the model of the second control chip is MP9457.

[0019] Further, a fourth control chip is arranged in the third control circuit.

[0020] The fifth pin of the fourth control chip is connected with one end of the twentieth resistor and the negative electrode of the seventh diode respectively; the other end of the twentieth resistor is connected with one end of the seventeenth capacitor; the other end of the seventeenth capacitor is connected with one end of the third inductor, the tenth pin of the third control chip and the eleventh pin of the third control chip respectively;

[0021] The positive electrode of the seventh diode is connected with the other end of the third inductor, one end of the nineteenth capacitor, one end of the twenty-third capacitor, one end of the twenty-fourth capacitor, one end of the tenth resistor, one end of the eleventh resistor and the seventh pin of the third control chip respectively;

[0022] The other end of the tenth resistor is connected with the fifth pin of the third control chip; the third pin of the third control chip is connected with one end of the fourteenth resistor;

[0023] The fourth pin of the third control chip is connected with one end of the twelfth resistor; the other end of the twelfth resistor is connected with the other end of the eleventh resistor, one end of the fourth resistor and one end of the fifteenth resistor respectively;

[0024] The eighth pin of the third control chip is connected with one end of the eighteenth capacitor, the B9 pin of the third interface and the B4 pin of the third interface respectively;

[0025] The A6 pin of the third interface is connected with one end of the eighth bidirectional diode; the A7 pin of the third interface is connected with one end of the ninth bidirectional diode;

[0026] The A5 pin of the third interface is connected with one end of the tenth bidirectional diode and the ninth pin of the third control chip respectively;

[0027] The other end of the fifteenth resistor, the other end of the fourteenth resistor, the sixth pin of the third control chip, the other end of the nineteenth capacitor, the other end of the twenty-third capacitor, the other end of the twenty-fourth capacitor, the other end of the eighteenth capacitor, the B12 pin of the third interface, the A1 pin of the third interface, the B1 pin of the third interface, the A12 pin of the third interface, the other end of the ninth bidirectional diode, the other end of the tenth bidirectional diode and the other end of the eighth bidirectional diode are grounded together.

[0028] Further, the model of the third control chip is MP5030.

[0029] Further, the model of the fourth control chip is MP9457.

[0030] The utility model discloses a circuit includes the first control circuit for preventing the effect of reverse connection, and with the first control circuit electric connection and be used for realizing the second control circuit or third control circuit of vehicle system step-down power supply, can directly power through direct current 24V power system and 12V power system, and do not distinguish power system.

[0031] That is, the scheme adopts buck step-down circuit, and the circuit cost will be low, and the vehicle system versatility is strong, the power line bundle requirement is low, and the vehicle system line bundle cost is reduced, that is, a 24V charging seat with the above scheme control circuit can be used for all vehicle types, can use 24V vehicle system, and can use 12V vehicle system, and the versatility is good. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the drawings needed in the embodiment description will be simply introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor;

[0033] Figure 1 It is a kind of step-down power supply control circuit structure schematic diagram suitable for vehicle system of the utility model;

[0034] Figure 2 It is the first control circuit schematic diagram of embodiment of a kind of step-down power supply control circuit suitable for vehicle system of the utility model;

[0035] Figure 3 It is the second control circuit schematic diagram of embodiment of a kind of step-down power supply control circuit suitable for vehicle system of the utility model;

[0036] Figure 4 It is the third control circuit schematic diagram of embodiment of a kind of step-down power supply control circuit suitable for vehicle system of the utility model.

[0037] In the figure: D1-first MOS tube; J1-first interface; R21-twenty-first resistance; R22-twenty-second resistance; C5-fifth capacitor; L1-first inductor; C6-sixth capacitor; C2-second capacitor; C1-first capacitor; C3-third capacitor; C4-fourth capacitor; D2-second bidirectional TVS tube; U1-second control chip; R19-nineteenth resistance; D3-third diode; C7-seventh capacitor; L2-second inductor; C28-twenty-eighth capacitor; C8-eighth capacitor; C9-ninth capacitor; C10-tenth capacitor; R2-second resistance; R8-eighth resistance; D6-sixth bidirectional diode; C12-twelfth capacitor; D4-fourth bidirectional diode; J2-second interface; D5-fifth bidirectional diode; R6-sixth resistance; U4-fourth control chip; R20-twentieth resistance; D7-seventh diode; C17-seventeenth capacitor; L3-third inductor; C19-nineteenth capacitor; C23-twenty-third capacitor; C24-twenty-fourth capacitor; R10-tenth resistance; R11-eleventh resistance; U3-third control chip; R14-fourteenth resistance; R20-twelfth resistance; R14-fourth resistance; R15-fifteenth resistance; C18-eighteenth capacitor; J3-third interface; D8-eighth bidirectional diode; D9-ninth bidirectional diode; D10-tenth bidirectional diode. DETAILED DESCRIPTION

[0038] In order to better understand the purpose, technical scheme and advantages of the utility model, the utility model is further described below in combination with the drawings and specific embodiments, and other advantages and effects of the utility model can be easily understood by those skilled in the art from the content disclosed in the description.

[0039] The utility model can also be implemented or applied through other different specific examples, and various modifications and changes can be made to the details in the description based on different viewpoints and applications without departing from the spirit of the utility model.

[0040] It should be noted that if the embodiment of the utility model involves directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings), if the specific posture changes, the directional indications also change accordingly.

[0041] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Secondly, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0042] The present invention will be further described below with reference to the accompanying drawings.

[0043] like Figures 1-3 As shown, this utility model provides a step-down power supply control circuit suitable for vehicle systems. The circuit includes a first control circuit for reverse connection protection; and a second or third control circuit electrically connected to the first control circuit for realizing step-down power supply to the vehicle system.

[0044] The first control circuit includes a first MOS transistor; the collector of the first MOS transistor is connected to one end of a second bidirectional TVS transistor and the third pin of the first interface; the base of the first MOS transistor is connected to one end of a 21st resistor and one end of a 22nd resistor; the emitter of the first MOS transistor is connected to the other end of the 21st resistor, one end of a fifth capacitor, and one end of a first inductor.

[0045] The other end of the first inductor is electrically connected to one end of the sixth capacitor, one end of the second capacitor, one end of the first capacitor, one end of the third capacitor, one end of the fourth capacitor, and the second or third control circuit, respectively.

[0046] The third pin of the first interface, the other end of the second bidirectional TVS diode, the other end of the second twelfth resistor, the other end of the fifth capacitor, the other end of the sixth capacitor, the other end of the second capacitor, the other end of the first capacitor, the other end of the third capacitor, and the other end of the fourth capacitor are all grounded.

[0047] The second bidirectional TVS diode is model SMBJ24CA.

[0048] The second control circuit includes a second control chip; the fifth pin of the second control chip is connected to one end of the nineteenth resistor and the negative terminal of the third diode, respectively; the other end of the nineteenth resistor is connected to one end of the seventh capacitor; the other end of the seventh capacitor is connected to one end of the second inductor, the tenth pin of the second control chip, and the eleventh pin of the second control chip, respectively.

[0049] The anode of the third diode is connected with the other end of the second inductor, one end of the twenty-eighth capacitor, one end of the eighth capacitor, one end of the ninth capacitor, one end of the tenth capacitor, one end of the second resistor, one end of the eighth resistor, one end of the sixth bidirectional diode and the first pin of the second interface respectively;

[0050] The other end of the eighth resistor is connected with the fifth pin of the first control chip and one end of the twelfth capacitor respectively; the first pin of the first control chip is connected with one end of the fourth bidirectional diode and the third pin of the second interface respectively;

[0051] The sixth pin of the first control chip is connected with one end of the fifth bidirectional diode and the second pin of the second interface respectively; the third pin of the first control chip is connected with the other end of the second resistor, one end of the sixth resistor and the second pin of the first control chip respectively;

[0052] The other end of the twenty-eighth capacitor, the other end of the eighth capacitor, the other end of the ninth capacitor, the other end of the tenth capacitor, the other end of the fourth bidirectional diode, the other end of the fifth bidirectional diode, the other end of the sixth bidirectional diode, the fourth pin of the first control chip, the other end of the twelfth capacitor, the second pin of the first control chip and the other end of the sixth resistor are grounded.

[0053] The model of the first control chip is FP6601Q. The model of the second control chip is MP9457.

[0054] The fourth control chip is arranged in the third control circuit; the fifth pin of the fourth control chip is connected with one end of the twentieth resistor and the negative electrode of the seventh diode respectively; the other end of the twentieth resistor is connected with one end of the seventeenth capacitor; the other end of the seventeenth capacitor is connected with one end of the third inductor, the tenth pin of the third control chip and the eleventh pin of the third control chip respectively;

[0055] The anode of the seventh diode is connected with the other end of the third inductor, one end of the nineteenth capacitor, one end of the twenty-third capacitor, one end of the twenty-fourth capacitor, one end of the tenth resistor, one end of the eleventh resistor and the seventh pin of the third control chip respectively;

[0056] The other end of the tenth resistor is connected with the fifth pin of the third control chip; the third pin of the third control chip is connected with one end of the fourteenth resistor;

[0057] The fourth pin of the third control chip is connected with one end of the twelfth resistor; the other end of the twelfth resistor is connected with the other end of the eleventh resistor, one end of the fourth resistor and one end of the fifteenth resistor respectively;

[0058] The eighth pin of the third control chip is connected with one end of the eighteenth capacitor, a B9 pin of the third interface and a B4 pin of the third interface respectively;

[0059] The A6 pin of the third interface is connected with one end of the eighth bidirectional diode; and the A7 pin of the third interface is connected with one end of the ninth bidirectional diode;

[0060] The A5 pin of the third interface is connected with one end of the tenth bidirectional diode and the ninth pin of the third control chip respectively;

[0061] The other end of the fifteenth resistor, the other end of the fourteenth resistor, the sixth pin of the third control chip, the other end of the nineteenth capacitor, the other end of the twenty-third capacitor, the other end of the twenty-fourth capacitor, the other end of the eighteenth capacitor, a B12 pin of the third interface, an A1 pin of the third interface, a B1 pin of the third interface, an A12 pin of the third interface, the other end of the ninth bidirectional diode, the other end of the tenth bidirectional diode and the other end of the eighth bidirectional diode are grounded.

[0062] The model of the third control chip is MP5030; and the model of the fourth control chip is MP9457.

[0063] Specifically, in the specific embodiment of the utility model, the circuit adopts MPS9457+ protocol chip MP5031 as C port charging, adopts MPS9457+ protocol chip FP6601 as A port charging, MP9457 in the circuit is a BUCK voltage reduction circuit, converts the input 24V voltage into mobile phone charging voltage 5V, FP6601Q is a TYPE-A protocol chip, and charging information interaction is carried out after successful handshaking with the mobile phone, MP5030 TYPE-C protocol chip carries out charging information interaction after successful handshaking with the mobile phone, the capacitor in the circuit plays the role of filtering, the resistor limits the role of current, the MOS tube plays the role of anti-reverse connection, the ESD is used for preventing static electricity from damaging components, and the inductor is used for storing energy.

[0064] The utility model discloses a circuit includes the first control circuit for preventing reverse connection effect, and the second control circuit or third control circuit for realizing vehicle-mounted system voltage reduction power supply and being electrically connected with the first control circuit, can directly power through direct current 24V power supply system and 12V power supply system, and does not distinguish power supply system.

[0065] That is, the scheme adopts a buck voltage reduction circuit, the circuit cost will be low, and the vehicle-mounted system is highly versatile, the requirement for the power harness is low, the cost of the vehicle-mounted system harness is reduced, that is, a 24V charging seat with the above scheme control circuit can be used for different vehicle models, and can be used for 24V vehicle-mounted systems or 12V vehicle-mounted systems, and is highly versatile.

[0066] The above-described embodiments only express several embodiments of the utility model, the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent range. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection range of the utility model. Therefore, the protection range of the utility model patent should be subject to the appended claims.

Claims

1. A step-down power supply control circuit suitable for use in a vehicle mounted system, characterized by, The circuit comprises a first control circuit for preventing reverse connection; and a second control circuit or a third control circuit electrically connected with the first control circuit and used for realizing step-down power supply of the vehicle-mounted system.

2. The step-down power supply control circuit for a vehicle-mounted system according to claim 1, wherein The first control circuit is provided with a first MOS tube; The collector of the first MOS tube is connected with one end of a second bidirectional TVS tube and a third pin of a first interface respectively; the base of the first MOS tube is connected with one end of a twenty-first resistor and one end of a twenty-second resistor respectively; the emitter of the first MOS tube is connected with the other end of the twenty-first resistor, one end of a fifth capacitor and one end of a first inductor respectively; The other end of the first inductor is electrically connected with one end of a sixth capacitor, one end of a second capacitor, one end of a first capacitor, one end of a third capacitor, one end of a fourth capacitor, the second control circuit or the third control circuit respectively; The third pin of the first interface, the other end of the second bidirectional TVS tube, the other end of the twenty-second resistor, the other end of the fifth capacitor, the other end of the sixth capacitor, the other end of the second capacitor, the other end of the first capacitor, the other end of the third capacitor and the other end of the fourth capacitor are commonly grounded.

3. The step-down power supply control circuit for a vehicle-mounted system according to claim 2, wherein The model of the second bidirectional TVS tube is SMBJ24CA.

4. The step-down power supply control circuit for a vehicle-mounted system according to claim 1 or 2, wherein The second control circuit is provided with a second control chip; The fifth pin of the second control chip is connected with one end of a nineteenth resistor and a negative electrode of a third diode respectively; the other end of the nineteenth resistor is connected with one end of a seventh capacitor; the other end of the seventh capacitor is connected with one end of a second inductor, the tenth pin of the second control chip and the eleventh pin of the second control chip respectively; The positive electrode of the third diode is connected with the other end of the second inductor, one end of a twenty-eighth capacitor, one end of an eighth capacitor, one end of a ninth capacitor, one end of a tenth capacitor, one end of a second resistor, one end of an eighth resistor, one end of a sixth bidirectional diode and a first pin of a second interface respectively; The other end of the eighth resistor is connected with the fifth pin of a first control chip and one end of a twelfth capacitor respectively; the first pin of the first control chip is connected with one end of a fourth bidirectional diode and a third pin of the second interface respectively; The sixth pin of the first control chip is connected with one end of a fifth bidirectional diode and a second pin of the second interface respectively; the third pin of the first control chip is connected with the other end of the second resistor, one end of a sixth resistor and the second pin of the first control chip respectively; The other end of the twenty-eighth capacitor, the other end of the eighth capacitor, the other end of the ninth capacitor, the other end of the tenth capacitor, the other end of the fourth bidirectional diode, the other end of the fifth bidirectional diode, the other end of the sixth bidirectional diode, the fourth pin of the first control chip, the other end of the twelfth capacitor, the second pin of the first control chip and the other end of the sixth resistor are commonly grounded.

5. The step-down power supply control circuit for a vehicle-mounted system according to claim 4, wherein The model of the first control chip is FP6601Q.

6. The step-down power supply control circuit for a vehicle-mounted system according to claim 4, wherein The model of the second control chip is MP9457.

7. The step-down power supply control circuit for a vehicle-mounted system according to claim 1 or 2, wherein The third control circuit is provided with a fourth control chip and a third control chip; One end of the twentieth resistor and the negative electrode of the seventh diode are connected with the fifth pin of the fourth control chip respectively; the other end of the twentieth resistor and one end of the seventeenth capacitor are connected; the other end of the seventeenth capacitor is connected with one end of the third inductor, the tenth pin of the fourth control chip and the eleventh pin of the fourth control chip respectively; The positive electrode of the seventh diode is connected with the other end of the third inductor, one end of the nineteenth capacitor, one end of the twenty-third capacitor, one end of the twenty-fourth capacitor, one end of the tenth resistor, one end of the eleventh resistor and the seventh pin of the third control chip respectively; The other end of the tenth resistor is connected with the fifth pin of the third control chip; the third pin of the third control chip is connected with one end of the fourteenth resistor; The fourth pin of the third control chip is connected with one end of the twelfth resistor; the other end of the twelfth resistor is connected with the other end of the eleventh resistor, one end of the fourth resistor and one end of the fifteenth resistor respectively; The eighth pin of the third control chip is connected with one end of the eighteenth capacitor, the B9 pin of the third interface and the B4 pin of the third interface respectively; The A6 pin of the third interface is connected with one end of the eighth bidirectional diode; the A7 pin of the third interface is connected with one end of the ninth bidirectional diode; The A5 pin of the third interface is connected with one end of the tenth bidirectional diode and the ninth pin of the third control chip respectively; The other end of the fifteenth resistor, the other end of the fourteenth resistor, the sixth pin of the third control chip, the other end of the nineteenth capacitor, the other end of the twenty-third capacitor, the other end of the twenty-fourth capacitor, the other end of the eighteenth capacitor, the B12 pin of the third interface, the A1 pin of the third interface, the B1 pin of the third interface, the A12 pin of the third interface, the other end of the ninth bidirectional diode, the other end of the tenth bidirectional diode and the other end of the eighth bidirectional diode are grounded.

8. The step-down power supply control circuit for a vehicle-mounted system according to claim 7, wherein The model of the third control chip is MP5030.

9. The step-down power supply control circuit for a vehicle-mounted system according to claim 7, wherein The model of the fourth control chip is MP9457.

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