A high-side driven always-on circuit for current sensing

Abstract

The embodiment of the application discloses a high-side driving constant-current circuit for current detection, relates to the technical field of electronic circuits, and can maintain the constant-current output of the high-side driving low-power consumption while not affecting the conventional use of the high-side driving circuit, so that the device requiring the constant-current input can normally work. The constant-current circuit comprises a power supply control module configured to determine whether to transmit a power signal to a load access end by itself according to a first control signal output by the high-side driving circuit; and an indication module connected with the power supply control module and configured to send an indication signal to the high-side driving circuit according to a voltage signal of the load access end in the case that the power supply control module transmits the power signal to the load access end by itself, and maintain the indication signal according to a second control signal sent by the high-side driving circuit; wherein the indication signal is used to indicate whether the high-side driving circuit is running. The application is suitable for the high-side driving circuit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic circuit, and in particular to a high-side driving constant power circuit with current detection. BACKGROUND

[0002] High-side driving can control the on-off of the circuit between the power supply and the load, and is widely used in various power consumption scenarios. For example, in new energy vehicles, high-side driving can be used to control the connection or disconnection between lithium batteries and any load in the vehicle. However, in many cases, high-side driving cannot maintain low-power constant power output, and cannot maintain the normal operation of devices that require constant power input (such as alarms, etc.). SUMMARY

[0003] Therefore, the embodiments of the present application provide a high-side driving constant power circuit with current detection, a high-side driving circuit integrated with the constant power circuit and an electronic device, which can maintain the low-power constant power output of the high-side driving circuit without affecting the normal use of the high-side driving circuit, so as to enable the normal operation of devices that require constant power input.

[0004] In a first aspect, the embodiments of the present application provide a high-side driving constant power circuit with current detection, comprising: a power supply control module configured to determine whether to transmit a power supply signal to a load access end through itself according to a first control signal output by a high-side driving circuit; an indication module connected to the power supply control module and configured to send an indication signal to the high-side driving circuit according to a voltage signal of the load access end in the case that the power supply control module transmits the power supply signal to the load access end through itself, and maintain the indication signal according to a second control signal sent by the high-side driving circuit; wherein the indication signal is used to indicate whether the high-side driving circuit is running; the high-side driving circuit is configured to monitor a load current of the load access end in the case that the high-side driving circuit is running, and determine the value of the first control signal, the value of the second control signal and whether to transmit the power supply signal to the load access end through itself according to the size relationship between the load current and a second threshold; and the power supply control module and the high-side driving circuit are not used to transmit the power supply signal to the load access end at the same time.

[0005] In an embodiment, the indication module is further configured to send the indication signal to the high-side driving circuit according to the second control signal sent by the high-side driving circuit in the case that the power supply control module refuses to transmit the power supply signal to the load access end.

[0006] In an embodiment, the power supply control module is configured to: in a case that the first control signal is a first control value, transmit the power signal to the load access end; or in a case that the first control signal is a second control value, refuse to transmit the power signal to the load access end, wherein the first control value is one of a high level or a low level, and the second control value is the other of the high level or the low level.

[0007] In an embodiment, the indication module is configured to: in a case that the power supply control module transmits the power signal to the load access end by itself, if a difference between the power signal and a voltage signal of the load access end is greater than a first threshold value, determine the indication signal as a first indication value to indicate the high-side drive circuit to operate according to the first indication value; the high-side drive circuit is configured to, in a case that the high-side drive circuit is in an operating state, respectively determine values of the first control signal and the second control signal, to make the power supply control module refuse to transmit the power signal to the load access end according to the first control signal, and make the indication module maintain the indication signal as the first indication value according to the second control signal; or in a case that the power supply control module transmits the power signal to the load access end by itself, if the difference between the power signal and the voltage signal of the load access end is less than or equal to the first threshold value, determine the indication signal as a second indication value to indicate the high-side drive circuit to be prohibited from operating according to the second value; the high-side drive circuit is configured to, in a case that the high-side drive circuit is in a prohibited operating state, respectively determine values of the first control signal and the second control signal, to make the power supply control module transmit the power signal to the load access end according to the first control signal, and make the indication module maintain the indication signal as the second indication value according to the second control signal.

[0008] In one embodiment, the indication module comprises a first transistor, a second transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a first diode, a second diode; the first transistor is an N-type field effect transistor, and the second transistor is a P-type field effect transistor; a first end of the first transistor is configured to be connected to the second control signal, a second end of the first transistor is connected to a first end of the second transistor through the first resistor, and a third end of the first transistor is grounded; wherein the first end comprises a gate, the second end comprises a drain, and the third end comprises a source; a first end of the second transistor is connected to the load access end through the third resistor, a second end of the second transistor is connected to one end of the fourth resistor, the other end of the fourth resistor is configured to be connected to the high-side drive circuit to send the indication signal to the high-side drive circuit, and a third end of the second transistor is connected to the power signal and the second end of the first transistor through the second resistor; wherein the first end comprises a gate, the second end comprises a drain, and the third end comprises a source; a positive electrode of the first diode is connected to the first end of the second transistor, and a negative electrode of the first diode is connected to the third end of the second transistor; a positive electrode of the second diode is grounded, and a negative electrode of the second diode is connected to the other end of the fourth resistor.

[0009] In one embodiment, the power supply control module comprises a third transistor, a fourth transistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a third diode; the third transistor is an N-type field effect transistor, and the fourth transistor is a P-type field effect transistor; a first end of the third transistor is configured to be connected to the first control signal, a second end of the third transistor is connected to a third end of the fourth transistor in sequence after being connected to the eighth resistor and the sixth resistor, and a third end of the third transistor is grounded; wherein the first end comprises a gate, the second end comprises a drain, and the third end comprises a source; a first end of the fourth transistor is connected between the eighth resistor and the sixth resistor, a second end of the fourth transistor is connected to the load access end through the fifth resistor; a third end of the fourth transistor is connected to the power signal, one end of the seventh resistor, and the sixth resistor, respectively, a negative electrode of the seventh resistor is connected to a positive electrode of the third diode, and the positive electrode of the third diode is connected to the third end of the third transistor, wherein the first end comprises a gate, the second end comprises a drain, and the third end comprises a source.

[0010] In one embodiment, the first control signal is at a high level and the second control signal is at a low level, or the first control signal is at a low level and the second control signal is at a high level.

[0011] In one embodiment, the first diode is configured to protect the second transistor, the third diode is configured to protect the third transistor, and the second diode is configured to clamp the indication signal.

[0012] In a second aspect, embodiments of the present application also provide a high-side drive circuit integrated with a normal-power circuit and an electronic device, which comprises the normal-power circuit and the high-side drive circuit, wherein the normal-power circuit is any of the normal-power circuits provided by embodiments of the present application; the normal-power circuit is connected to the high-side drive circuit, and the normal-power circuit and the high-side drive circuit do not operate at the same time.

[0013] In one embodiment, the power supply control module of the normal-power circuit is connected to the first control output end of the high-side drive circuit, and is configured to determine whether to transmit the power supply signal to the load access end according to the first control signal output by the first control output end; the indication module of the normal-power circuit is connected to the second control output end of the high-side drive circuit, and is configured to: in the case that the power supply control module transmits the power supply signal to the load access end through itself, send an indication signal to the high-side drive circuit according to the voltage signal of the load access end, and maintain the indication signal according to the second control signal sent by the second control output end; in the case that the power supply control module refuses to transmit the power supply signal to the load access end, send the indication signal to the high-side drive circuit according to the second control signal sent by the second control output end; and the indication module of the normal-power circuit is also connected to the input end of the high-side drive circuit, and is configured to send the indication signal to the input end of the high-side drive circuit, so that the high-side drive circuit determines whether to operate itself according to the indication signal.

[0014] In one embodiment, the high-side drive circuit is also configured to, in the case that the high-side drive circuit operates itself, monitor the load current of the load access end, and in the case that the load current is less than a second threshold value, make the normal-power circuit operate through the first control signal and the second control signal, and make the high-side drive circuit stop operating itself.

[0015] In a third aspect, embodiments of the present application also provide an electronic device, which comprises any of the high-side drive circuits integrated with a normal-power circuit provided by embodiments of the present application.

[0016] The embodiment of the present application provides a high-side driving constant-current circuit with current detection, a high-side driving circuit integrated with the constant-current circuit and electronic equipment. BRIEF DESCRIPTION OF DRAWINGS BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0018] Figure 1 A structural schematic diagram of the high-side driving constant-current circuit with current detection provided by the embodiment of the present application;

[0019] Figure 2 A circuit diagram of the high-side driving constant-current circuit with current detection provided by the embodiment of the present application;

[0020] Figure 3 A structural schematic diagram of the high-side driving circuit integrated with the constant-current circuit provided by the embodiment of the present application;

[0021] Figure 4 Another structural schematic diagram of the high-side driving circuit integrated with the constant-current circuit provided by the embodiment of the present application. DETAILED DESCRIPTION

[0022] The embodiments of the present application will be described in detail below with reference to the drawings.

[0023] It should be noted that the embodiments described above are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0024] In a first aspect, the embodiments of the present application provide a high-side driving constant power circuit with current detection, which can maintain the constant power output of the high-side driving low power consumption while not affecting the normal use of the high side, so that the device requiring constant power input can work normally.

[0025] As shown in Figure 1 The embodiments of the present application provide a high-side driving constant power circuit 1 with current detection, which comprises:

[0026] The power supply control module 11 is configured to determine whether to transmit the power supply signal VS to the load access end OUT by itself according to the first control signal PC1 output by the high-side driving circuit 2.

[0027] The indication module 12 is connected with the power supply control module 11 and is configured to send an indication signal IN to the high-side driving circuit 2 according to the voltage signal VOUT of the load access end OUT in the case that the power supply control module 11 transmits the power supply signal VS to the load access end OUT by itself, and maintain the indication signal IN according to the second control signal PC2 sent by the high-side driving circuit 2; wherein the indication signal IN is used to indicate whether the high-side driving circuit 2 is running; the high-side driving circuit 2 is configured to monitor the load current of the load access end in the case that it runs by itself, and determine the value of the first control signal PC1, the value of the second control signal PC2 and whether to transmit the power supply signal VS to the load access end OUT by itself according to the size relationship between the load current and the second threshold; the power supply control module 11 and the high-side driving circuit 2 are not used to transmit the VS power supply signal to the load access end OUT at the same time.

[0028] The embodiment of the present application provides the high-side driving constant-current circuit 1 for current detection, wherein the power supply control module 11 can determine whether to transmit the power supply signal VS to the load access end OUT by itself according to the first control signal PC1 output by the high-side driving circuit 2, so as to determine whether to drive the load by the high-side driving constant-current circuit 1; and the indication module 12 can send the indication signal IN to the high-side driving circuit 2 according to the voltage signal VOUT of the load access end OUT on one hand and maintain the indication signal IN according to the second control signal PC2 sent by the high-side driving circuit 2 on the other hand in the case that the power supply control module 11 transmits the power supply signal VS to the load access end OUT by itself, so as to indicate whether the high-side driving circuit 2 is running through the indication signal IN, and further determine whether the high-side driving circuit 2 transmits the power supply signal VS to the load access end OUT by itself according to whether the high-side driving circuit 2 is running, so as to indicate whether the state of driving the load by the high-side driving constant-current circuit 1 is switched to the state of driving the load by the high-side driving circuit 2 through the indication signal IN. Therefore, the high-side driving constant-current circuit 1 for current detection provided by the embodiment of the present application can replace the high-side driving circuit to drive the low-power-consumption load with long running time, so as to save power consumption, and can switch the state of driving the load by the high-side driving constant-current circuit 1 to the state of driving the load by the high-side driving circuit 2 according to needs, so as to maintain the high-side driving low-power-consumption constant-current output without affecting the conventional use of the high-side driving circuit, and make the device requiring the constant-current input work normally.

[0029] Specifically, in the embodiment of the present application, the power supply signal VS can include various power supply signals, for example, the power supply signal provided by a lithium battery. The output power of the power supply signal VS can be adjusted according to the needs of the load, for example, for the load with large power, the power supply signal VS can provide large output power, and for the load with small power, the power supply signal VS can provide small load. Further, the output voltage of the power supply signal VS can also be adjusted according to the needs of the load, which is not limited in the embodiment of the present application.

[0030] The load access end OUT can be used for accessing the load, and the power supply control module 11 can control the closure or disconnection of the passage between the power supply signal VS and the load access end OUT, so as to control whether to provide the power supply signal VS to the load by itself.

[0031] Specifically, in one embodiment of the present application, the power supply control module 11 can determine whether to transmit the power supply signal VS to the load access end OUT by itself according to the first control signal PC1 output by the high-side drive circuit 2. Specifically, in one embodiment of the present application, the power supply control module 11 can be configured to transmit the power supply signal VS to the load access end OUT when the first control signal PC1 is a first control value, or refuse to transmit the power supply signal VS to the load access end OUT when the first control signal PC1 is a second control value, wherein the first control value can be one of high level or low level, and the second control value is the other of high level or low level.

[0032] In one embodiment of the present application, when the power supply control module 11 transmits the power supply signal VS to the load access end OUT by itself, the indication module 12 can send the indication signal IN to the high-side drive circuit 2 according to the voltage signal VOUT of the load access end OUT, that is, the magnitude of the voltage signal VOUT of the load access end OUT will affect the value of the indication signal IN, and further affect the operating state of the high-side drive circuit 2. In turn, the operating state of the high-side drive circuit 2 will affect the values of the first control signal PC1 and the second control signal PC2, wherein the first control signal PC1 can be applied to the power supply control module 11 to control whether the power supply control module 11 transmits the power supply signal VS to the load access end OUT, and the second control signal PC2 can be applied to the indication module 12 to maintain the value of the indication signal IN.

[0033] In one embodiment of the present application, the power supply control module 11 and the high-side drive circuit 2 can both be used to transmit the power supply signal VS to the load access end OUT, but according to the first control signal PC1, the second control signal PC2 and the indication signal IN, the power supply control module 11 and the high-side drive circuit 2 are not used to transmit the power supply signal VS to the load access end OUT at the same time, that is, the power supply control module 11 and the high-side drive circuit 2 can alternate with each other to transmit the power supply signal VS to the load access end OUT.

[0034] Specifically, according to whether the high-side drive circuit 2 is operating, the values of the first control signal PC1 and the second control signal PC2 can be determined, and whether the high-side drive circuit 2 transmits the power supply signal VS to the load access end OUT can also be determined. In one embodiment of the present application, when the high-side drive circuit 2 is operating, the power supply signal VS can be transmitted to the load access end OUT, and when the high-side drive circuit 2 is not operating, the power supply signal VS can be refused to be transmitted to the load access end OUT.

[0035] In the embodiment of the present application, the indication module 12 can send the indication signal IN to the high-side drive circuit 2 according to the voltage signal VOUT of the load access end OUT and maintain the indication signal IN according to the second control signal PC2 sent by the high-side drive circuit 2 in the case that the power supply control module 11 transmits the power supply signal VS to the load access end OUT by itself. That is to say, the change of the voltage signal VOUT of the load access end OUT can affect the value of the indication signal IN.

[0036] Specifically, in one embodiment of the present application, the indication module 12 can be configured to determine the indication signal IN as a first indication value to indicate the high-side drive circuit 2 to run according to the first indication value in the case that the power supply control module 11 transmits the power supply signal VS to the load access end OUT by itself, if the difference between the power supply signal VS and the voltage signal VOUT of the load access end OUT is greater than a first threshold. Wherein, the high-side drive circuit 2 can determine the values of the first control signal PC1 and the second control signal PC2 respectively in the case that the high-side drive circuit 2 is in a running state, so as to make the power supply control module 11 refuse to transmit the power supply signal VS to the load access end OUT according to the first control signal PC1, and make the indication module 12 maintain the indication signal IN as the first indication value according to the second control signal PC2. For example, when the voltage of the power supply signal VS rises or when the resistance of the load accessed by the load access end OUT becomes low, the difference between the power supply signal VS and the voltage signal VOUT of the load access end OUT will become large, if the difference is greater than the first threshold, the indication signal IN can be set to the first indication value, so as to indicate the high-side drive circuit 2 to run. In this way, when the voltage of the power supply signal VS is high or the resistance of the load is low, resulting in large power consumption of the load, the power supply signal VS can be transmitted to the load access end OUT through the high-side drive circuit 2, so as to meet the demand of the load.

[0037] In another embodiment of the present application, the indication module 12 can also be configured to determine the indication signal IN as a second indication value to indicate the high-side drive circuit 2 to be prohibited from running according to the second value in the case that the power supply control module 11 transmits the power supply signal VS to the load access end OUT by itself, if the difference between the power supply signal VS and the voltage signal VOUT of the load access end OUT is less than or equal to the first threshold. Wherein, the high-side drive circuit 2 can determine the values of the first control signal PC1 and the second control signal PC2 respectively in the case that the high-side drive circuit 2 is in a prohibited running state, so as to make the power supply control module 11 transmit the power supply signal VS to the load access end OUT according to the first control signal PC1, and make the indication module 12 maintain the indication signal IN as the second indication value according to the second control signal PC2.

[0038] For example, in the case that the difference between the power supply signal VS and the voltage signal VOUT of the load access end OUT is less than or equal to the first threshold value, it indicates that the current load power consumption is low, and the indication module 12 can maintain the indication signal IN as the second indication value, so as to instruct the high-side drive circuit 2 to stop running and continue to transmit the power supply signal VS to the load access end VOUT through the always-on circuit 1.

[0039] The foregoing embodiment introduces the working condition of the indication module 11 in the case that the power supply control module 11 transmits the power supply signal VS to the load access end OUT by itself, but the embodiment of the present application is not limited thereto. In other embodiments of the present application, in addition to transmitting the indication signal IN to the high-side drive circuit 2 according to the voltage signal VOUT of the load access end OUT in the case that the power supply control module 11 transmits the power supply signal VS to the load access end OUT by itself, the indication module 12 can also transmit the indication signal IN to the high-side drive circuit 2 according to the second control signal PC2 sent by the high-side drive circuit 2 in the case that the power supply control module 11 refuses to transmit the power supply signal VS to the load access end OUT. That is to say, in the case that the power supply control module 11 refuses to transmit the power supply signal VS to the load access end OUT, the value of the indication signal IN can be determined by the second control signal PC2, rather than according to the voltage signal VOUT of the load access end OUT. This is because, since the power supply control module 11 and the high-side drive circuit 2 do not transmit the power supply signal VS to the load access end OUT at the same time, in the case that the power supply control module 11 refuses to transmit the power supply signal VS to the load access end OUT, the high-side drive circuit 2 can be in a running state according to the indication of the indication signal IN, so as to transmit the power supply signal VS to the load access end OUT, and on the other hand, the high-side drive circuit 2 can set corresponding values for the first control signal PC1 and the second control signal PC2 according to the indication of the indication signal IN, so as to control the power supply control module 11 and the indication module 12.

[0040] In the embodiment of the present application, the power supply control module 11 can determine whether to transmit the power supply signal VS to the load access end OUT by itself according to the first control signal PC1 output by the high-side drive circuit 2. Specifically, in an embodiment of the present application, the power supply control module 11 can be configured to: in the case that the first control signal PC1 is a first control value, transmit the power supply signal VS to the load access end OUT; or in the case that the first control signal PC1 is a second control value, refuse to transmit the power supply signal VS to the load access end OUT, wherein the first control value can be one of high level or low level, and the second control value is the other of high level or low level.

[0041] In the embodiment of the present application, the indication module 12 and the power supply control module 11 can be implemented by various specific circuit elements.

[0042] For example, as Figure 2 In an embodiment of the present application, the indication module 12 can include a first transistor T1, a second transistor T2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first diode D1, and a second diode D2; wherein the first transistor T1 is an N-type field effect transistor, and the second transistor T2 is a P-type field effect transistor.

[0043] The first end of the first transistor T1 is used to connect the second control signal PC2, the second end of the first transistor T1 is connected to the first end of the second transistor T2 through the first resistor R1, and the third end of the first transistor T1 is grounded; wherein the first end includes a gate, the second end includes a drain, and the third end includes a source; the first end of the second transistor T2 is connected to the load access end OUT through the third resistor R3, the second end of the second transistor T2 is connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 is used to connect the high-side drive circuit 2 to send the indication signal IN to the high-side drive circuit 2, the third end of the second transistor T2 is connected to the power signal VS, and the third end of the second transistor T2 is also connected to the second end of the first transistor T1 through the second resistor R2; wherein the first end includes a gate, the second end includes a drain, and the third end includes a source; the anode of the first diode D1 is connected to the first end of the second transistor T2, and the cathode of the first diode D1 is connected to the third end of the second transistor T2; the anode of the second diode D2 is grounded, and the cathode of the second diode D2 is connected to the other end of the fourth resistor R4.

[0044] Correspondingly, the power supply control module 11 can include a third transistor T3, a fourth transistor T4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a third diode D3; the third transistor T3 is an N-type field effect transistor, and the fourth transistor T4 is a P-type field effect transistor.

[0045] The first end of the third transistor T3 is used for connecting the first control signal PC1, the second end of the third transistor T3 is connected with the eighth resistor R8 and the sixth resistor R6 in sequence, and then is connected with the third end of the fourth transistor T4, and the third end of the third transistor T3 is grounded; wherein the first end comprises a gate, the second end comprises a drain, and the third end comprises a source; the first end of the fourth transistor T4 is connected between the eighth resistor R8 and the sixth resistor R6, the second end of the fourth transistor T4 is connected with the load access end OUT through the fifth resistor R5; the third end of the fourth transistor T4 is connected with the power supply signal VS, one end of the seventh resistor R7 and the sixth resistor R6 respectively, the other end of the seventh resistor R7 is connected with the negative electrode of the third diode D3, and the positive electrode of the third diode D3 is connected with the third end of the third transistor T3, wherein the first end comprises a gate, the second end comprises a drain, and the third end comprises a source.

[0046] In one embodiment of the present application, the level of the first control signal PC1 can be logically opposite to the level of the second control signal PC2. For example, in one case, the first control signal PC1 can be high level, and the second control signal PC2 can be low level; in another case, the first control signal PC1 can be low level, and the second control signal PC2 can be high level.

[0047] Referring to Figure 2 In the embodiment, the always-on circuit is composed of two PMOS transistors, two NMOS transistors and several resistors. When the high-side driving circuit 2 is running, the first control signal PC1 is low level, the third transistor T3 is off, the fourth transistor T4 is off, and the voltage signal VS cannot be output to the load access end OUT, that is, the always-on circuit 1 does not supply power to the load access end OUT at this time. At the same time, the second control signal PC2 is high level, the first transistor T1 is on, the first end of the second transistor T2 is low level, so that the second transistor T2 is also on, and the power supply signal VS can be output through the second transistor T2, so that the indication signal IN is high level, and is stabilized to the required range of the high level of the input voltage of the high-side driving circuit 2 through the voltage stabilization of the second diode D2.

[0048] The specific working mode of the circuit has two kinds, one is that the load access end OUT is in the state of being supplied by the always-on circuit 1 and enters the state of being supplied by the high-side driving circuit 2, and the other is that the load access end is in the state of being supplied by the high-side driving circuit 2 and enters the state of being supplied by the always-on circuit 1.

[0049] Firstly, how the state that the load access end OUT is powered by the always-on circuit 1 enters the state that the load access end OUT is powered by the high-side drive circuit 2 is introduced. In the case that the load access end OUT is powered by the always-on circuit 1, the first control signal PC1 is high level, the second control signal PC2 is low level, the third transistor T3 and the fourth transistor T4 are turned on, the first transistor T1 and the second transistor T2 are turned off, the power supply signal VS is divided by the fifth resistor R5 and the load resistor ROUT to obtain the voltage VOUT of the load access end OUT, and the voltage VOUT is transmitted to the first end of the second transistor T2. When the power supply signal VS increases or the load resistor ROUT decreases, so that the difference between the power supply signal VS and the voltage VOUT is less than the first threshold value (that is, the voltage difference between the gate and the source of the second transistor T2 reaches the opening voltage of the second transistor T2), the second transistor T2 is turned on, and the indication signal IN is high level, so that the high-side drive circuit 2 enters the running state. Correspondingly, when the high-side drive circuit 2 runs, on the one hand, the first control signal PC1 can be set to low level, so that the third transistor T3 is turned off and the fourth transistor T4 is also turned off, and the power supply signal VS cannot be transmitted to the load access end OUT through the always-on circuit 1; on the other hand, the second control signal PC2 can be set to high level, so that the first transistor T1 and the second transistor T2 are turned on, and the high level of the indication signal IN is further maintained.

[0050] Next, how the state that the load access end OUT is powered by the high-side drive circuit 2 enters the state that the load access end OUT is powered by the always-on circuit 1 is introduced. In the case that the load access end OUT is powered by the high-side drive circuit 2, the second control signal PC2 is high level, the first transistor T1 and the second transistor T2 are turned on, the third transistor T3 and the fourth transistor T4 are turned off, and the indication signal IN is high level. When the always-on circuit 1 needs to supply power to the load access end OUT, the high-side drive circuit 2 can set the first control signal PC1 to high level according to the internal logic, so that the third transistor T3 and the fourth transistor T4 are turned on, the power supply signal VS is output to the load access end OUT through the always-on circuit 1, and on the other hand, the second control signal PC2 can be set to low level, so that the first transistor T1 and the second transistor T2 are turned off, and the indication signal IN is low level, and the high-side drive circuit 2 can stop running according to the low level of the indication signal IN.

[0051] In the embodiment of the application, the first diode D1 can be used to protect the second transistor T2, the third diode D3 can be used to protect the third transistor T3, and the second diode D2 can be used to clamp the indication signal IN.

[0052] Secondly, the high-side drive circuit 3 integrated with the always-on circuit is provided. As shown in FIG. 3, the high-side drive circuit 3 comprises a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a first diode D1, a second diode D2, a third diode D3, a first control signal PC1, a second control signal PC2, and an indication signal IN.Figure 3 As shown in the embodiment of the present application, the high-side drive circuit 3 integrated with the always-on circuit can include the always-on circuit 1 and the high-side drive circuit 2, wherein the always-on circuit 1 can be any one of the always-on circuits 1 for high-side drive with current detection provided in the foregoing embodiments; the always-on circuit 1 is connected with the high-side drive circuit 2, and the always-on circuit 1 and the high-side drive circuit 2 do not operate at the same time.

[0053] Since the high-side drive circuit 3 integrated with the always-on circuit includes any one of the always-on circuits 1 provided in the embodiments of the present application, the corresponding beneficial technical effects can also be achieved, which have been described in detail above and will not be repeated here.

[0054] Specifically, as shown in the embodiment of the present application, the power supply control module 11 of the always-on circuit 1 is connected with the first control output end CTR1 of the high-side drive circuit 2, and is configured to determine whether to transmit the power supply signal VS to the load access end OUT according to the first control signal PC1 output by the first control output end CTR1. Figure 4

[0055] The indication module 12 of the always-on circuit 1 is connected with the second control output end CTR2 of the high-side drive circuit 2, and is configured to: in the case that the power supply control module 11 transmits the power supply signal VS to the load access end OUT through itself, send the indication signal IN to the high-side drive circuit 2 according to the voltage signal VOUT of the load access end OUT, and maintain the indication signal IN according to the second control signal PC2 sent by the second control output end CTR2; in the case that the power supply control module 11 refuses to transmit the power supply signal VS to the load access end OUT, send the indication signal IN to the high-side drive circuit 2 according to the second control signal PC2 sent by the second control output end CTR2.

[0056] The indication module 12 of the always-on circuit 1 is also connected with the input end INPUT of the high-side drive circuit 2, and is configured to send the indication signal IN to the input end INPUT of the high-side drive circuit 2, so that the high-side drive circuit 2 determines whether to operate itself according to the indication signal IN.

[0057] In an embodiment, the high-side drive circuit 2 is also configured to, in the case that the high-side drive circuit 2 operates itself, monitor the load current of the load access end OUT, and in the case that the load current is less than the second threshold value, make the always-on circuit 1 operate and make the high-side drive circuit 2 stop operating through the first control signal PC1 and the second control signal PC2. That is to say, in the case that the load current is too small, the load power consumption is low, and therefore the always-on circuit 1 can be used to supply power to the load.

[0058] ​Correspondingly, in a third aspect, embodiments of the present application also provide an electronic device, which can include any high-side drive circuit integrated with a normal-circuit provided by the embodiments of the present application, and thus can also achieve the corresponding technical effects, which have been described in detail above and thus will not be repeated here.

[0059] It should be noted that, in this document, the terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between such entities or operations. Also, the terms "comprises", "comprising", or any other variations thereof are intended to cover a non-exclusive inclusion, so that a process, method, article, or apparatus that includes a list of elements does not only include those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0060] Each of the embodiments in the specification is described in a relevant manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the difference from other embodiments.

[0061] Especially, for the device embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the part of the description of the method embodiments.

[0062] For the convenience of description, the above device is described in various units / modules respectively according to functions. Of course, in the implementation of the present application, the functions of each unit / module can be implemented in the same or multiple software and / or hardware.

[0063] The above description is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any changes or replacements within the technical scope disclosed by the present application can be easily thought by those skilled in the art, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A high-side driven always-on circuit for current sensing, characterized by, The application relates to a power supply control module and an indication module. The power supply control module is configured to determine whether to transmit a power supply signal to a load access end according to a first control signal output by a high-side drive circuit. The indication module is connected to the power supply control module and is configured to send an indication signal to the high-side drive circuit according to a voltage signal of the load access end when the power supply control module transmits the power supply signal to the load access end, and maintain the indication signal according to a second control signal sent by the high-side drive circuit; the indication signal is used for indicating whether the high-side drive circuit is running; the high-side drive circuit is configured to monitor a load current of the load access end when the high-side drive circuit is running, and determine a value of the first control signal, a value of the second control signal and whether to transmit the power supply signal to the load access end according to a size relationship between the load current and a second threshold value; the power supply control module and the high-side drive circuit are not used for transmitting the power supply signal to the load access end at the same time; the high-side drive circuit is specifically used for monitoring the load current of the load access end when the high-side drive circuit is running, and making the constant power circuit run and stopping the high-side drive circuit from running through the first control signal and the second control signal when the load current is smaller than the second threshold value. The indication module is also configured to send the indication signal to the high-side drive circuit according to the second control signal sent by the high-side drive circuit when the power supply control module refuses to transmit the power supply signal to the load access end. The indication module comprises a first transistor, a second transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a first diode and a second diode; the first transistor is an N-type field effect transistor, and the second transistor is a P-type field effect transistor. A first end of the first transistor is used for connecting the second control signal, a second end of the first transistor is connected to a first end of the second transistor through the first resistor, and a third end of the first transistor is grounded; the first end comprises a gate, the second end comprises a drain, and the third end comprises a source. A first end of the second transistor is connected to the load access end through the third resistor, a second end of the second transistor is connected to one end of the fourth resistor, the other end of the fourth resistor is used for connecting the high-side drive circuit to send the indication signal to the high-side drive circuit, and a third end of the second transistor is connected to the power supply signal and is also connected to the second end of the first transistor through the second resistor; the first end comprises a gate, the second end comprises a drain, and the third end comprises a source. A positive electrode of the first diode is connected to the first end of the second transistor, and a negative electrode of the first diode is connected to the third end of the second transistor. A positive electrode of the second diode is grounded, and a negative electrode of the second diode is connected to the other end of the fourth resistor. The power supply control module comprises a third transistor, a fourth transistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor and a third diode; the third transistor is an N-type field effect transistor, and the fourth transistor is a P-type field effect transistor; a first end of the third transistor is configured to be connected to the first control signal, a second end of the third transistor is connected to the eighth resistor and the sixth resistor in sequence, and a third end of the third transistor is connected to the fourth transistor; wherein the first end comprises a gate, the second end comprises a drain, and the third end comprises a source; a first end of the fourth transistor is connected between the eighth resistor and the sixth resistor, a second end of the fourth transistor is connected to the load access end through the fifth resistor; a third end of the fourth transistor is connected to the power supply signal, one end of the seventh resistor and the sixth resistor respectively, the other end of the seventh resistor is connected to a negative electrode of the third diode, and a positive electrode of the third diode is connected to the third end of the third transistor; wherein the first end comprises a gate, the second end comprises a drain, and the third end comprises a source; The indication module is configured to: In the case that the power supply control module transmits the power supply signal to the load access end by itself, if the difference between the power supply signal and the voltage signal of the load access end is greater than a first threshold value, it is determined that the indication signal is a first indication value, so as to indicate the high-side drive circuit to operate according to the first indication value; the high-side drive circuit is configured to determine the values of the first control signal and the second control signal respectively in the case that the high-side drive circuit is in an operating state, so as to make the power supply control module refuse to transmit the power supply signal to the load access end according to the first control signal, and make the indication module maintain the indication signal as the first indication value according to the second control signal; Or, In the case that the power supply control module transmits the power supply signal to the load access end by itself, if the difference between the power supply signal and the voltage signal of the load access end is less than or equal to the first threshold value, it is determined that the indication signal is a second indication value, so as to indicate the high-side drive circuit to be prohibited from operating according to the second value; the high-side drive circuit is configured to determine the values of the first control signal and the second control signal respectively in the case that the high-side drive circuit is in a prohibited operating state, so as to make the power supply control module transmit the power supply signal to the load access end according to the first control signal, and make the indication module maintain the indication signal as the second indication value according to the second control signal.

2. The always-on circuit of claim 1, wherein the power supply control module is configured to: transmit the power supply signal to the load access end in the case that the first control signal is a first control value; or ​ In a case that the first control signal is a second control value, the power signal is refused to be transmitted to the load access end, wherein the first control value is one of high level or low level, and the second control value is the other of high level or low level.

3. The normally on circuit of claim 1, wherein, In a case that the first control signal is high level and the second control signal is low level, or the first control signal is low level and the second control signal is high level.

4. The normally on circuit of claim 1, wherein, The first diode is used for protecting the second transistor, the third diode is used for protecting the third transistor, and the second diode is used for clamping the indication signal.

5. A high-side driver circuit integrated with a constant-on circuit, characterized by The high-side driving circuit integrated with the always-on circuit comprises the always-on circuit according to any one of claims 1 to 4, and the always-on circuit and the high-side driving circuit are connected and do not operate at the same time.

6. The high-side driving circuit integrated with the always-on circuit according to claim 5, wherein, the power supply control module of the always-on circuit is connected with a first control output end of the high-side driving circuit, and is used for determining whether to transmit the power signal to the load access end according to the first control signal output by the first control output end; the indication module of the always-on circuit is connected with a second control output end of the high-side driving circuit, and is used for: in a case that the power supply control module transmits the power signal to the load access end by itself, sending an indication signal to the high-side driving circuit according to a voltage signal of the load access end, and maintaining the indication signal according to the second control signal sent by the second control output end; and in a case that the power supply control module refuses to transmit the power signal to the load access end, sending the indication signal to the high-side driving circuit according to the second control signal sent by the second control output end; the indication module of the always-on circuit is also connected with an input end of the high-side driving circuit, and is used for sending the indication signal to the input end of the high-side driving circuit, so that the high-side driving circuit determines whether to operate according to the indication signal.

7. An electronic device, comprising: The electronic device comprises the high-side driving circuit integrated with the always-on circuit according to any one of claims 5 to 6.

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