Switching control circuit for low-voltage battery and high-voltage battery

Abstract

The utility model discloses a low-voltage battery and high-voltage battery switching control circuit, which comprises two MOS (Metal Oxide Semiconductor) tubes for flowing and conveying current, five N-type metal-oxide-semiconductors, two comparators, a high-voltage battery and a low-voltage battery, wherein the two MOS tubes for flowing and conveying current are M1 and M3 respectively, the five N-type metal-oxide-semiconductors are M2, M4, M5, M6 and M7 respectively, and the two comparators are connected with the high-voltage battery. The two comparators are U1A and U1B respectively, the precise voltage reference is U2, the low-voltage battery power supply channel is VKL30UBD, the five high-voltage battery reverse power supply channels are VDD14EM, one power supply inlet is used for supplying power to a low-voltage network, and the other power supply inlet is used for supplying power to the low-voltage network. One power supply inlet for sending power to the low-voltage network is VKL30UBR, and whether the reverse power supply function of the high-voltage power supply is normal or not can be judged.

Description

Technical Field

[0001] The utility model belongs to the technical field of power supply, and specifically relates to a switching control circuit of a low-voltage battery and a high-voltage battery. Background Art

[0002] In the inverter system for motor drive, in order to ensure that the entire low-voltage power supply network is not affected when the low-voltage battery is undervoltage and to ensure that the system enters a safe state more reliably, under the existing solution, the high-voltage battery can supply power to the low-voltage network, but the low-voltage static current is too large, and it is impossible to make a logical judgment on whether the high-voltage system is normal. Utility Model Content

[0003] The purpose of the utility model is to provide a low-voltage battery and a high-voltage battery switching control circuit for existing devices to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: a low-voltage battery and a high-voltage battery switching control circuit, comprising

[0005] Two MOS transistors for carrying current, wherein the two MOS transistors for carrying current are M1 and M3 respectively;

[0006] Five N-type metal-oxide-semiconductors, wherein the five N-type metal-oxide-semiconductors are M2, M4, M5, M6 and M7;

[0007] Two comparators, the two comparators are respectively U1A and U1B;

[0008] A precision voltage reference, wherein the precision voltage reference is U2;

[0009] A low-voltage battery power supply channel, wherein the low-voltage battery power supply channel is V_KL30_UBD;

[0010] Five high-voltage battery reverse power supply channels, wherein the five high-voltage battery reverse power supply channels are all V_DD14_EM;

[0011] A power supply inlet for a low voltage network, wherein the power supply inlet for a low voltage network is V_KL30_UBR;

[0012] The two low-voltage batteries provide enable signals for supplying power to the low-voltage network, and the two enable signals for supplying power to the low-voltage network by the low-voltage batteries are V_5V_D and VI_KL15_ENA respectively.

[0013] The utility model further illustrates that the M1 is connected to M2, the M1 is connected to M3, the M3 is connected to M6, the M6 ​​is connected to M7, and the M4 is connected to M5.

[0014] The utility model further illustrates that the M4 is connected to U1A, and the U1A is connected to M6 and M7 respectively;

[0015] The M7 is connected to U1B, and the U1A is connected to U1B.

[0016] The utility model further illustrates that U2 is connected to U1A and U1B respectively.

[0017] The utility model further illustrates that the V_KL30_UBD is connected to the V_KL30_UBR, the V_KL30_UBD is connected to M2, and the V_KL30_UBR is connected to M3.

[0018] The utility model further illustrates that the V_5V_D is connected to M2, and the VI_KL15_ENA is connected to M2.

[0019] Compared with the prior art, the beneficial effect achieved by the utility model is as follows: the utility model can judge whether the reverse power supply function of the high-voltage power supply is normal by optimizing the circuit. If the reverse power supply function of the high-voltage power supply is not judged, the reverse power supply function of the high-voltage power supply is abnormal and KL30 is undervoltage, and switching under such working conditions is meaningless. At the same time, VDD14_EM is set in the optimized circuit to reduce the static current consumed when the whole machine is in sleep mode, thereby avoiding the logic control circuit from taking power from the front end of KL30, resulting in excessive static current consumed when the whole machine is in sleep mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 It is a schematic diagram of a complete switching control circuit of the utility model;

[0022] Figure 2 This is a schematic diagram of the local switching control circuit of the utility model. Figure 1 ;

[0023] Figure 3 This is a schematic diagram of the local switching control circuit of the utility model. Figure 2 . DETAILED DESCRIPTION

[0024] The following is a further non-limiting detailed description of the technical solution of the utility model in conjunction with the preferred embodiments and the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-3 The utility model provides a technical solution: a low-voltage battery and a high-voltage battery switching control circuit, comprising two MOS tubes for flowing and transporting current, wherein the two MOS tubes for flowing and transporting current are M1 and M3 respectively;

[0026] Five N-type metal-oxide-semiconductors, wherein the five N-type metal-oxide-semiconductors are M2, M4, M5, M6 and M7;

[0027] Two comparators, the two comparators are respectively U1A and U1B;

[0028] A precision voltage reference, wherein the precision voltage reference is U2;

[0029] A low-voltage battery power supply channel, wherein the low-voltage battery power supply channel is V_KL30_UBD;

[0030] Five high-voltage battery reverse power supply channels, wherein the five high-voltage battery reverse power supply channels are all V_DD14_EM;

[0031] A power supply inlet for a low voltage network, wherein the power supply inlet for a low voltage network is V_KL30_UBR;

[0032] The two low-voltage batteries provide enable signals for supplying power to the low-voltage network, and the two enable signals for supplying power to the low-voltage network by the low-voltage batteries are V_5V_D and VI_KL15_ENA respectively.

[0033] The M1 is connected to M2, the M1 is connected to M3, the M3 is connected to M6, the M6 ​​is connected to M7, and the M4 is connected to M5.

[0034] The M4 is connected to U1A, and the U1A is connected to M6 and M7 respectively;

[0035] The M7 is connected to U1B, and the U1A is connected to U1B.

[0036] The U2 is connected to U1A and U1B respectively.

[0037] The V_KL30_UBD is connected to the V_KL30_UBR, the V_KL30_UBD is connected to M2, and the V_KL30_UBR is connected to M3.

[0038] The V_5V_D is connected to M2, and the VI_KL15_ENA is connected to M2.

[0039] During normal operation:

[0040] (1) When V_KL30_UBD < VTH1 (low-voltage power supply undervoltage threshold)

[0041] a. If VDD14_EM < VTH2 (reverse power supply undervoltage threshold), the output of U1B is open, M7 conducts, M6 cuts off, and M3 cuts off;

[0042] It is powered by V_KL30_UBD.

[0043] b. If VDD14_EM ≥ VTH2, the output of U1B is low, M7 cuts off, M6 conducts, and M3 conducts;

[0044] It is powered by VDD14_EM.

[0045] (2) When V_KL30_UBD > VTH1, regardless of whether VDD14_EM is undervoltaged, it is powered by V_KL30_UBD.

[0046] When the whole machine enters the sleep state:

[0047] VI_KL15_ENA = 0, V_KL30_UBD > VTH1, the V_5V_D of the SBC has no voltage, M1 cuts off, M4 cuts off, M5 cuts off, and the circuit considers V_KL30_UBD < VTH1;

[0048] a. If VDD14_EM < VTH2, the system loses power, and the static current of V_KL30_UBD is 0A;

[0049] b. If VDD14_EM ≥ VTH2, then M3 conducts, the system is powered by VDD14_EM, and the static current of V_KL30_UBD is 0A.

[0050] After the whole machine is awakened from the sleep state:

[0051] At this time, V_KL30_UBD > VTH1, VI_KL15_ENA is powered on, the V_5V_D of the SBC returns to normal, M1 conducts, M4 conducts, M5 conducts, and the circuit detects that V_KL30_UBD > VTH1. Regardless of whether VDD14_EM is undervoltaged, it is powered by V_KL30_UBD.

[0052] By optimizing the circuit, it is possible to judge whether the reverse power supply function of the high-voltage power supply is normal. If the reverse power supply function of the high-voltage power supply is not normal, it will switch when the reverse power supply function of the high-voltage power supply is abnormal and KL30 is undervoltage. The switching under this condition is meaningless. At the same time, VDD14_EM is set in the optimized circuit to reduce the static current consumed when the whole machine is in sleep mode, thereby avoiding the logic control circuit power supply from the front end of KL30, resulting in excessive static current consumption when the whole machine is in sleep mode.

[0053] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0054] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit them. Although the utility model is described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A low voltage battery and high voltage battery switching control circuit, characterized in that: include Two MOS transistors for carrying current, wherein the two MOS transistors for carrying current are M1 and M3 respectively; Five N-type metal-oxide-semiconductors, wherein the five N-type metal-oxide-semiconductors are M2, M4, M5, M6 and M7; Two comparators, the two comparators are respectively U1A and U1B; A precision voltage reference, wherein the precision voltage reference is U2; A low-voltage battery power supply channel, wherein the low-voltage battery power supply channel is V_KL30_UBD; Five high-voltage battery reverse power supply channels, wherein the five high-voltage battery reverse power supply channels are all V_DD14_EM; A power supply inlet for a low voltage network, wherein the power supply inlet for a low voltage network is V_KL30_UBR; The two low-voltage batteries provide enable signals for supplying power to the low-voltage network, and the two enable signals for supplying power to the low-voltage network by the low-voltage batteries are V_5V_D and VI_KL15_ENA respectively.

2. A low voltage battery and high voltage battery switching control circuit according to claim 1, characterized in that: The M1 is connected to M2, the M1 is connected to M3, the M3 is connected to M6, the M6 ​​is connected to M7, and the M4 is connected to M5.

3. A low voltage battery and high voltage battery switching control circuit according to claim 2, characterized in that: The M4 is connected to U1A, and the U1A is connected to M6 and M7 respectively; The M7 is connected to U1B, and the U1A is connected to U1B.

4. A low voltage battery and high voltage battery switching control circuit according to claim 3, characterized in that: The U2 is connected to U1A and U1B respectively.

5. A low voltage battery and high voltage battery switching control circuit according to claim 4, characterized in that: The V_KL30_UBD is connected to the V_KL30_UBR, the V_KL30_UBD is connected to M2, and the V_KL30_UBR is connected to M3.

6. A low voltage battery and high voltage battery switching control circuit according to claim 5, characterized in that: The V_5V_D is connected to M2, and the VI_KL15_ENA is connected to M2.

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