High-side-driven constant electric circuit with current detection function

Abstract

The embodiment of the invention discloses a constant power circuit for a high-side drive with current detection, relates to the technical field of electronic circuits, and can maintain low-power-consumption constant power output of the high-side drive without influencing the conventional use of the high-side drive circuit so as to enable equipment needing constant power input to work normally. The constant power circuit comprises: a power supply control module configured to determine whether to transmit a power signal to a load access end through itself according to a first control signal output by a high-side driving circuit; the indication module is connected with the power supply control module, and is configured to send an indication signal to a high-side driving circuit according to a voltage signal of a load access end under the condition that the power supply control module transmits a power signal to the load access end through the indication module, and maintain the indication signal according to a second control signal sent by the high-side driving circuit; wherein the indication signal is used for indicating whether the high-side driving circuit operates or not. The driving circuit is suitable for a high-side driving circuit.

Description

Technical Field

[0001] The invention relates to the technical field of electronic circuits, and in particular to a constant current circuit for high-side driving with current detection. Background Art

[0002] High-side drivers can control the on / off of the circuit between the power supply and the load, so they are widely used in various power usage scenarios. Taking new energy vehicles as an example, high-side drivers can be used to control the on / off between the lithium battery and any load in the car. However, in many cases, high-side drivers 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 of the invention

[0003] In view of this, an embodiment of the present invention provides a constant power circuit for a high-side driver with current detection, a high-side driver circuit integrated with a constant power circuit, and an electronic device, which can maintain the low-power constant power output of the high-side driver without affecting the normal use of the high-side driver circuit, so as to enable the normal operation of the device requiring constant power input.

[0004] In a first aspect, an embodiment of the present invention provides a constant power circuit for a high-side drive with current detection, comprising: a power supply control module, configured to determine whether to transmit a power signal to a load access terminal by itself according to a first control signal output by a high-side drive circuit; an indication module, connected to the power supply control module, configured to send an indication signal to the high-side drive circuit according to a voltage signal at the load access terminal when the power supply control module transmits the power signal to the load access terminal by itself, and maintain the indication signal according to a second control signal sent by the high-side drive circuit; wherein the indication signal is used to indicate whether the high-side drive circuit is operating; the high-side drive circuit is configured to monitor the load current at the load access terminal when it is operating, and determine the value of the first control signal, the value of the second control signal, and determine whether to transmit the power signal to the load access terminal by itself according to the magnitude relationship between the load current and a second threshold; the power supply control module and the high-side drive circuit are not used to transmit the power signal to the load access terminal at the same time.

[0005] In one embodiment, the indication module is further constructed to send the indication signal to the high-side driver circuit according to the second control signal sent by the high-side driver circuit when the power supply control module refuses to transmit the power signal to the load access terminal.

[0006] In one embodiment, the power supply control module is constructed to: transmit the power signal to the load access terminal when the first control signal is a first control value; or refuse to transmit the power signal to the load access terminal when the first control signal is a second control value, wherein the first control value is one of a high level or a low level, and the second control value is the other of a high level or a low level.

[0007] In one embodiment, the indication module is constructed as follows: when the power supply control module transmits the power signal to the load access terminal by itself, if the difference between the power signal and the voltage signal of the load access terminal is greater than a first threshold value, the indication signal is determined to be a first indication value, so as to instruct the high-side drive circuit to operate according to the first indication value; the high-side drive circuit is constructed to determine the values ​​of the first control signal and the second control signal respectively when it is in an operating state, so that the power supply control module refuses to transmit the power signal to the load access terminal according to the first control signal, and the indication module maintains the indication signal as the first control signal according to the second control signal. The first indication value; or, when the power supply control module transmits the power signal to the load access terminal by itself, if the difference between the power signal and the voltage signal at the load access terminal is less than or equal to the first threshold value, then the indication signal is determined to be the second indication value, so as to instruct the high-side drive circuit to prohibit operation according to the second value; the high-side drive circuit is constructed to determine the values ​​of the first control signal and the second control signal respectively when it is in a prohibited operation state, so that the power supply control module transmits the power signal to the load access terminal according to the first control signal, and the indication module maintains the indication signal to the second indication value according to the second control signal.

[0008] In one embodiment, the indication module includes 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; the first end of the first transistor is used to connect the second control signal, the second end of the first transistor is connected to the first end of the second transistor through the first resistor, and the third end of the first transistor 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 is connected to the load access end through the third resistor, the second end of the second transistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is used to connect the high-side drive circuit to send the indication signal to the high-side drive circuit, the third end of the second transistor is connected to the power supply signal, and the third end of the second transistor is also connected to the second end of the first transistor through the second resistor; wherein the first end includes a gate, the second end includes a drain, and the third end includes a source; the positive electrode of the first diode is connected to the first end of the second transistor, and the negative electrode of the first diode is connected to the third end of the second transistor; the positive electrode of the second diode is grounded, and the 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 includes 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; the first end of the third transistor is used to connect the first control signal, the second end of the third transistor is connected in series with the eighth resistor and the sixth resistor in sequence, and then connected to the third end of the fourth transistor, and the third end of the third transistor 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 fourth transistor is connected between the eighth resistor and the sixth resistor, and the second end of the fourth transistor is connected to the load access end through the fifth resistor; the third end of the fourth transistor is respectively connected to the power signal, one end of the seventh resistor and the sixth resistor, the other end of the seventh resistor is connected to the negative 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 includes a gate, the second end includes a drain, and the third end includes a source.

[0010] In one implementation, when the first control signal is at a high level, the second control signal is at a low level; or, when the first control signal is at a low level, the second control signal is at a high level.

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

[0012] In a second aspect, an embodiment of the present invention further provides a high-side driving circuit and an electronic device integrated with a constant power circuit, comprising a constant power circuit and a high-side driving circuit, wherein the constant power circuit is any constant power circuit provided in an embodiment of the present invention; the constant power circuit is connected to the high-side driving circuit, and the constant power circuit and the high-side driving 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 used to determine 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 normal power circuit is connected to the second control output end of the high-side drive circuit, and is used to: when the power supply control module transmits the power signal to the load access end by 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; when the power supply control module refuses to transmit the power 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; the indication module of the normal power circuit is also connected to the input end of the high-side drive circuit, and is used to send the indication signal to the input end of the high-side drive circuit, so that the high-side drive circuit determines whether it is running according to the indication signal.

[0014] In one embodiment, the high-side drive circuit is also used to monitor the load current at the load access end when the high-side drive circuit is running. When the load current is less than a second threshold, the normal power circuit is operated and the high-side drive circuit stops running through the first control signal and the second control signal.

[0015] In a third aspect, an embodiment of the present invention further provides an electronic device, wherein the electronic device comprises any high-side driver circuit integrated with a constant power circuit provided by an embodiment of the present invention.

[0016] The embodiments of the present invention provide a constant power circuit for high-side driving with current detection, a high-side driving circuit integrated with the constant power circuit, and an electronic device. The power supply control module of the constant power circuit can determine whether to transmit the power signal to the load access terminal through itself according to the first control signal output by the high-side driving circuit, thereby determining whether to drive the load through the constant power circuit. The indication module can, when the power supply control module transmits the power signal to the load access terminal through itself, on the one hand, send an indication signal to the high-side driving circuit according to the voltage signal at the load access terminal, and on the other hand, maintain the indication signal according to the second control signal sent by the high-side driving circuit. In this way, the indication signal can be used to indicate whether the high-side driving circuit is running, and based on whether the high-side driving circuit is running, it can be further determined whether the high-side driving circuit transmits the power signal to the load access terminal through itself. In this way, the indication signal can be used to indicate whether the state of driving the load by the constant power circuit is switched to the state of driving the load by the high-side driving circuit. Therefore, the constant power circuit for high-side driving with current detection provided in the embodiments of the present invention can replace the high-side driving circuit to drive a load with low power consumption but long operating time to save power consumption, and can also switch the state of the constant power circuit driving the load to the state of the high-side driving circuit driving the load as needed. Therefore, it is possible to maintain the low-power constant power output of the high-side driving without affecting the normal use of the high-side driving circuit, so as to enable the normal operation of the equipment requiring constant power input. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic structural diagram of a constant current circuit for a high-side driver with current detection provided by an embodiment of the present invention; Figure 2 A circuit diagram of a constant current circuit for a high-side driver with current detection provided by an embodiment of the present invention; Figure 3 A schematic structural diagram of a high-side driver circuit integrated with a constant current circuit provided by an embodiment of the present invention; Figure 4 Another structural schematic diagram of a high-side driver circuit integrated with a constant power circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0020] It should be clear that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In a first aspect, an embodiment of the present invention provides a constant power circuit for a high-side driver with current detection, which can maintain a low-power constant power output of the high-side driver without affecting the normal use of the high side, so as to enable a device requiring constant power input to operate normally.

[0022] like Figure 1 As shown, an embodiment of the present invention provides a constant current circuit 1 for high-side driving with current detection, comprising: The power supply control module 11 is configured to determine whether to transmit the power supply signal VS to the load access terminal OUT through itself according to the first control signal PC1 output by the high-side driving circuit 2; The indication module 12 is connected to the power supply control module 11 and is constructed to send an indication signal IN to the high-side driving circuit 2 according to the voltage signal VOUT of the load access terminal OUT when the power supply control module 11 transmits the power signal VS to the load access terminal 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 constructed to monitor the load current of the load access terminal when it is running, and determine the value of the first control signal PC1, the value of the second control signal PC2 and whether to transmit the power signal VS to the load access terminal OUT by itself according to the relationship between the load current and the second threshold value; the power supply control module 11 and the high-side driving circuit 2 are not used to transmit the VS power signal to the load access terminal OUT at the same time.

[0023] The embodiment of the present invention provides a permanent power circuit 1 for high-side driving with current detection, wherein the power supply control module 11 can determine whether to transmit the power signal VS to the load access terminal OUT by itself according to the first control signal PC1 output by the high-side driving circuit 2, thereby determining whether to drive the load through the permanent power circuit 1, and the indication module 12 can, when the power supply control module 11 transmits the power signal VS to the load access terminal OUT by itself, on the one hand, send the indication signal IN to the high-side driving circuit 2 according to the voltage signal VOUT of the load access terminal OUT, and on the other hand, maintain the indication signal IN according to the second control signal PC2 sent by the high-side driving circuit 2, so that it can 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 signal VS to the load access terminal OUT by itself according to whether the high-side driving circuit 2 is running, so that it can indicate whether the state of the permanent power circuit 1 driving the load is switched to the state of the high-side driving circuit 2 driving the load through the indication signal IN. Therefore, the constant power circuit 1 for high-side driving with current detection provided in the embodiment of the present invention can replace the high-side driving circuit to drive a load with low power consumption but long operation time to save power consumption, and can also switch the state of the constant power circuit 1 driving the load to the state of the high-side driving circuit 2 driving the load as needed, so that the low-power constant power output of the high-side driving can be maintained without affecting the normal use of the high-side driving circuit, so that the equipment requiring constant power input can work normally. Specifically, in an embodiment of the present invention, the power signal VS may include electrical signals provided by various power sources, such as electrical signals provided by a lithium battery. The output power of the power signal VS may be adjusted according to the requirements of the load. For example, for a load with a larger power, the power signal VS may provide a larger output power, and for a load with a smaller power, the power signal VS may provide a smaller load. Furthermore, the output voltage of the power signal VS may also be adjusted accordingly according to the requirements of the load, and the embodiments of the present invention are not limited to this.

[0024] The load access terminal OUT can be used to access the load, and the power supply control module 11 can control the closing or opening of the path between the power signal VS and the load access terminal OUT, thereby controlling whether to provide the power signal VS to the load through itself.

[0025] Specifically, in one embodiment of the present invention, the power supply control module 11 can determine whether to transmit the power signal VS to the load access terminal 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 invention, the power supply control module 11 can be constructed as follows: when the first control signal PC1 is a first control value, the power signal VS is transmitted to the load access terminal OUT; or, when the first control signal PC1 is a second control value, the power signal VS is refused to be transmitted to the load access terminal OUT, wherein the first control value can be one of a high level or a low level, and the second control value can be the other of a high level or a low level.

[0026] In the embodiment of the present invention, when the power supply control module 11 transmits the power supply signal VS to the load access terminal 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 terminal OUT, that is, the magnitude of the voltage signal VOUT of the load access terminal 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 terminal OUT, and the second control signal PC2 can be applied to the indication module 12 to maintain the value of the indication signal IN.

[0027] In an embodiment of the present invention, the power supply control module 11 or the high-side drive circuit 2 can be used to transmit the power signal VS to the load access terminal 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 signal VS to the load access terminal 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 signal VS to the load access terminal OUT.

[0028] Specifically, according to whether the high-side drive circuit 2 is running, the values ​​of the first control signal PC1 and the second control signal PC2 can be determined, and it can also be determined whether the high-side drive circuit 2 transmits the power signal VS to the load access terminal OUT. In one embodiment of the present invention, when the high-side drive circuit 2 is running, the power signal VS can be transmitted to the load access terminal OUT, and when the high-side drive circuit 2 is not running, the power signal VS can be refused to be transmitted to the load access terminal OUT.

[0029] In the embodiment of the present invention, when the power supply control module 11 transmits the power supply signal VS to the load access terminal OUT by itself, 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 terminal OUT, and maintain the indication signal IN according to the second control signal PC2 sent by the high-side driving circuit 2. That is to say, the change of the voltage signal VOUT of the load access terminal OUT can affect the value of the indication signal IN.

[0030] Specifically, in one embodiment of the present invention, the indication module 12 may be configured as follows: when the power supply control module 11 transmits the power supply signal VS to the load access terminal OUT by itself, if the difference between the power supply signal VS and the voltage signal VOUT of the load access terminal OUT is greater than the first threshold value, the indication signal IN is determined to be the first indication value, so as to indicate the operation of the high-side drive circuit 2 according to the first indication value. Wherein, the high-side drive circuit 2 may determine the values ​​of the first control signal PC1 and the second control signal PC2 respectively when it is in the operation state, so that the power supply control module 11 refuses to transmit the power supply signal VS to the load access terminal OUT according to the first control signal PC1, and the indication module 12 maintains 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 increases or when the resistance of the load connected to the load access terminal OUT becomes lower, the difference between the power supply signal VS and the voltage signal VOUT of the load access terminal OUT will increase. If the difference is greater than the first threshold value, the indication signal IN may be set to the first indication value, thereby indicating the operation of the high-side drive circuit 2. In this way, when the voltage of the power signal VS is high or the resistance of the load is low, resulting in high load power consumption, the power signal VS can be transmitted to the load access terminal OUT through the high-side drive circuit 2 to meet the load demand.

[0031] In another embodiment of the present invention, the indication module 12 may also be configured as follows: when the power supply control module 11 transmits the power supply signal VS to the load access terminal OUT by itself, if the difference between the power supply signal VS and the voltage signal VOUT of the load access terminal OUT is less than or equal to the first threshold, the indication signal IN is determined to be a second indication value, so as to indicate that the high-side drive circuit 2 is prohibited from operating according to the second value. Wherein, the high-side drive circuit 2 may determine the values ​​of the first control signal PC1 and the second control signal PC2 respectively when it is in a prohibited operation state, so that the power supply control module 11 transmits the power supply signal VS to the load access terminal OUT according to the first control signal PC1, and the indication module 12 maintains the indication signal IN as the second indication value according to the second control signal PC2.

[0032] For example, when the difference between the power signal VS and the voltage signal VOUT at the load access terminal OUT is less than or equal to the first threshold, 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, thereby instructing the high-side drive circuit 2 to prohibit operation and continue to transmit the power signal VS to the load access terminal VOUT through the normal power circuit 1.

[0033] The above-mentioned embodiment describes the working condition of the indication module 11 when the power supply control module 11 transmits the power signal VS to the load access terminal OUT by itself, but the embodiments of the present invention are not limited thereto. In other embodiments of the present invention, 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 terminal OUT when the power supply control module 11 transmits the power signal VS to the load access terminal OUT by itself, and can also send 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 when the power supply control module 11 refuses to transmit the power signal VS to the load access terminal OUT. That is to say, when the power supply control module 11 refuses to transmit the power signal VS to the load access terminal OUT, the value of the indication signal IN can be determined by the second control signal PC2 instead of being determined by the voltage signal VOUT of the load access terminal OUT. This is because, since the power supply control module 11 and the high-side drive circuit 2 are not used to transmit the power signal VS to the load access terminal OUT at the same time, when the power supply control module 11 refuses to transmit the power signal VS to the load access terminal OUT, the high-side drive circuit 2 can, on the one hand, be in an operating state according to the indication of the indication signal IN, thereby transmitting the power signal VS to the load access terminal OUT, and on the other hand, 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.

[0034] In an embodiment of the present invention, the power supply control module 11 can determine whether to transmit the power signal VS to the load access terminal 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 invention, the power supply control module 11 can be constructed as follows: when the first control signal PC1 is a first control value, the power signal VS is transmitted to the load access terminal OUT; or, when the first control signal PC1 is a second control value, the power signal VS is refused to be transmitted to the load access terminal OUT, wherein the first control value can be one of a high level or a low level, and the second control value can be the other of a high level or a low level.

[0035] In the embodiment of the present invention, the indication module 12 and the power supply control module 11 can be implemented by various specific circuit elements.

[0036] For example, Figure 2 As described above, in one embodiment of the present invention, the indication module 12 may 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.

[0037] 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 terminal OUT through the third resistor R3, the second end of the second transistor T2 is connected to one end of the fourth resistor R4, and 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 supply 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 positive electrode of the first diode D1 is connected to the first end of the second transistor T2, and the negative electrode of the first diode D1 is connected to the third end of the second transistor T2; the positive electrode of the second diode D2 is grounded, and the negative electrode of the second diode D2 is connected to the other end of the fourth resistor R4.

[0038] Correspondingly, the power supply control module 11 may 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.

[0039] The first end of the third transistor T3 is used to connect the first control signal PC1, the second end of the third transistor T3 is connected in series with the eighth resistor R8 and the sixth resistor R6 in sequence, and then connected to the third end of the fourth transistor T4, and the third end of the third transistor T3 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 fourth transistor T4 is connected between the eighth resistor R8 and the sixth resistor R6, and the second end of the fourth transistor T4 is connected to the load access terminal OUT through the fifth resistor R5; the third end of the fourth transistor T4 is respectively connected to the power supply signal VS, one end of the seventh resistor R7 and the sixth resistor R6, the other end of the seventh resistor R7 is connected to the negative electrode of the third diode D3, and the positive electrode of the third diode D3 is connected to the third end of the third transistor T3, wherein, the first end includes a gate, the second end includes a drain, and the third end includes a source.

[0040] In one embodiment of the present invention, the level of the first control signal PC1 may be logically opposite to the level of the second control signal PC2. For example, in one example, the first control signal PC1 may be at a high level and the second control signal PC2 may be at a low level; in another example, the first control signal PC1 may be at a low level and the second control signal PC2 may be at a high level.

[0041] See also Figure 2 In this embodiment, the constant power circuit is composed of two PMOS tubes, two NMOS tubes and a number of resistors. When the high-side drive circuit 2 is running, the first control signal PC1 is at a low level, the third transistor T3 is turned off, the fourth transistor T4 is turned off, and the voltage signal VS cannot be output to the load access terminal OUT, that is, the constant power circuit 1 does not supply power to the load access terminal OUT at this time. At the same time, the second control signal PC2 is at a high level, the first transistor T1 is turned on, and the first end of the second transistor T2 is at a low level, so that the second transistor T2 is also turned on, and the power signal VS can be output through the second transistor T2, so that the indication signal IN is at a high level, and stabilized to the range required by the high level of the input voltage of the high-side drive circuit 2 through the voltage stabilization effect of the second diode D2.

[0042] There are two specific working modes of this circuit. One is that the load access terminal OUT changes from the state powered by the normal power circuit 1 to the state powered by the high-side drive circuit 2. The other is that the load access terminal changes from the state powered by the high-side drive circuit 2 to the state powered by the normal power circuit 1.

[0043] First, it is introduced how the state where the load access terminal OUT is powered by the normal power circuit 1 enters the state where the load access terminal OUT is powered by the high-side drive circuit 2. When the load access terminal OUT is powered by the normal power circuit 1, the first control signal PC1 is at a high level, the second control signal PC2 is at a 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 signal VS is divided by the fifth resistor R5 and the load resistor ROUT to obtain the voltage VOUT of the load access terminal OUT, and the voltage VOUT is transmitted to the first end of the second transistor T2. When the power signal VS increases or the load resistor ROUT decreases, so that the difference between the power 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 turn-on voltage of the second transistor T2), the second transistor T2 is turned on, the indication signal IN is at a high level, and the high-side drive circuit 2 enters the operating state. Accordingly, when the high-side driving circuit 2 is running, on the one hand, the first control signal PC1 can be set to a low level, thereby disconnecting the third transistor T3 and the fourth transistor T4, and the power supply signal VS cannot be transmitted to the load access terminal OUT through the normal power circuit 1; on the other hand, the second control signal PC2 can be set to a high level, thereby turning on the first transistor T1 and the second transistor T2, and further maintaining the indication signal IN at a high level.

[0044] Next, it is described how the state where the load access terminal OUT is powered by the high-side drive circuit 2 enters the state where the load access terminal OUT is powered by the normal power circuit 1. When the load access terminal OUT is powered by the high-side drive circuit 2, the second control signal PC2 is at a 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 at a high level. When the normal power circuit 1 is required to supply power to the load access terminal OUT, the high-side drive circuit 2 can, according to the internal logic, on the one hand, set the first control signal PC1 to a high level, thereby turning on the third transistor T3 and the fourth transistor T4, so that the power signal VS is output to the load access terminal OUT through the normal power circuit 1, and on the other hand, set the second control signal PC2 to a low level, thereby turning off the first transistor T1 and the second transistor T2, and the indication signal IN is at a low level, and the high-side drive circuit 2 can stop operating according to the low level of the indication signal IN.

[0045] In the embodiment of the present invention, the first diode D1 may be used to protect the second transistor T2, the third diode D3 may be used to protect the third transistor T3, and the second diode D2 may be used to clamp the indication signal IN.

[0046] In the second aspect, corresponding to the above-mentioned permanent power circuit 1 for high-side driving with current detection, an embodiment of the present invention further provides a high-side driving circuit 3 integrated with a permanent power circuit. Figure 3 As shown, in an embodiment of the present invention, a high-side driving circuit 3 integrated with a constant power circuit may include a constant power circuit 1 and a high-side driving circuit 2, wherein the constant power circuit 1 may be any one of the constant power circuits 1 for high-side driving with current detection provided in the aforementioned embodiments; the constant power circuit 1 and the high-side driving circuit 2 are connected, and the constant power circuit 1 and the high-side driving circuit 2 do not operate at the same time.

[0047] Since the high-side driving circuit 3 integrated with the constant power circuit includes any constant power circuit 1 provided in the embodiments of the present invention, corresponding beneficial technical effects can be achieved, which have been described in detail above and will not be repeated here.

[0048] Specifically, if Figure 4 As shown, in one embodiment of the present invention, the power supply control module 11 of the normal power circuit 1 is connected to the first control output terminal CTR1 of the high-side driving circuit 2, and is used to determine whether to transmit the power signal VS to the load access terminal OUT according to the first control signal PC1 output by the first control output terminal CTR1; The indication module 12 of the constant power circuit 1 is connected to the second control output terminal CTR2 of the high-side driving circuit 2, and is used for: when the power supply control module 11 transmits the power supply signal VS to the load access terminal OUT by itself, sending the indication signal IN to the high-side driving circuit 2 according to the voltage signal VOUT of the load access terminal OUT, and maintaining the indication signal IN according to the second control signal PC2 sent by the second control output terminal CTR2; when the power supply control module 11 refuses to transmit the power supply signal VS to the load access terminal OUT, sending the indication signal IN to the high-side driving circuit 2 according to the second control signal PC2 sent by the second control output terminal CTR2; The indication module 12 of the constant power circuit 1 is also connected to the input terminal INPUT of the high-side driving circuit 2, and is used to send an indication signal IN to the input terminal INPUT of the high-side driving circuit 2, so that the high-side driving circuit 2 determines whether it is running according to the indication signal IN.

[0049] In one embodiment, the high-side driver circuit 2 is also used to monitor the load current of the load access terminal OUT when the high-side driver circuit 2 is running. When the load current is less than the second threshold, the normal power circuit 1 is operated through the first control signal PC1 and the second control signal PC2, and the high-side driver circuit 2 stops running. In other words, when the load current is too small, the load power consumption is low, so the normal power circuit 1 can be used to power the load.

[0050] Correspondingly, in the third aspect, an embodiment of the present invention further provides an electronic device, which may include any high-side driving circuit integrated with a constant power circuit provided by the embodiments of the present invention, thereby also being able to achieve the corresponding technical effects, which have been described in detail above and will not be repeated here.

[0051] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0052] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0053] In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0054] For the convenience of description, the above device is described by dividing the functions into various units / modules. Of course, when implementing the present invention, the functions of each unit / module can be implemented in the same or multiple software and / or hardware.

[0055] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A constant current circuit for high-side driving with current detection, characterized in that: include: A power supply control module is configured to determine whether to transmit the power supply signal to the load access terminal through itself according to a first control signal output by the high-side drive circuit; An indication module is connected to the power supply control module and is constructed to send an indication signal to the high-side drive circuit according to the voltage signal at the load access terminal when the power supply control module transmits the power signal to the load access terminal by itself, and maintain the indication signal according to the second control signal sent by the high-side drive circuit; wherein the indication signal is used to indicate whether the high-side drive circuit is operating; the high-side drive circuit is constructed to monitor the load current at the load access terminal when it is operating, and determine the value of the first control signal, the value of the second control signal and whether to transmit the power signal to the load access terminal by itself according to the relationship between the load current and the second threshold value; the power supply control module and the high-side drive circuit are not used to transmit the power signal to the load access terminal at the same time.

2. The permanent current circuit according to claim 1, characterized in that: 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 when the power supply control module refuses to transmit the power signal to the load access terminal.

3. The permanent current circuit according to claim 1, characterized in that: The power supply control module is constructed as follows: When the first control signal is a first control value, transmitting the power signal to the load access terminal; or, When the first control signal is a second control value, the power signal is refused to be transmitted to the load access terminal, wherein the first control value is one of a high level or a low level, and the second control value is the other of a high level or a low level.

4. The permanent current circuit according to claim 1, characterized in that: The indication module is constructed as follows: In the case where the power supply control module transmits the power signal to the load access terminal by itself, if the difference between the power signal and the voltage signal of the load access terminal is greater than a first threshold, determining that the indication signal is a first indication value, so as to instruct the high-side drive circuit to operate according to the first indication value; The high-side drive circuit is configured to respectively determine the values ​​of the first control signal and the second control signal when the high-side drive circuit is in an operating state, so that the power supply control module refuses to transmit the power signal to the load access terminal according to the first control signal, and the indication module maintains the indication signal at the first indication value according to the second control signal; or, In the case where the power supply control module transmits the power signal to the load access terminal by itself, if the difference between the power signal and the voltage signal of the load access terminal is less than or equal to the first threshold, determining that the indication signal is a second indication value, so as to instruct the high-side drive circuit to prohibit operation according to the second value; The high-side drive circuit is constructed to respectively determine the values ​​of the first control signal and the second control signal when the high-side drive circuit is in a prohibited operation state, so that the power supply control module transmits the power signal to the load access terminal according to the first control signal, and the indication module maintains the indication signal at the second indication value according to the second control signal.

5. The permanent current circuit according to claim 1, characterized in that: The indication module includes 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; The first end of the first transistor is used to connect the second control signal, the second end of the first transistor is connected to the first end of the second transistor through the first resistor, and the third end of the first transistor 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 is connected to the load access end through the third resistor, the second end of the second transistor is connected to one end of the fourth resistor, the other end of the fourth resistor is used to connect to the high-side drive circuit to send the indication signal to the high-side drive circuit, the third end of the second transistor is connected to the power signal, and the third end of the second transistor is also connected to the second end of the first transistor through the second resistor; wherein the first end includes a gate, the second end includes a drain, and the third end includes a source; An anode of the first diode is connected to a first end of the second transistor, and a cathode of the first diode is connected to a third end of the second transistor; An anode of the second diode is grounded, and a cathode of the second diode is connected to the other end of the fourth resistor.

6. The permanent current circuit according to claim 5, characterized in that: The power supply control module includes 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; The first end of the third transistor is used to connect the first control signal, the second end of the third transistor is connected in series with the eighth resistor and the sixth resistor in sequence, and then connected to the third end of the fourth transistor, and the third end of the third transistor 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 fourth transistor is connected between the eighth resistor and the sixth resistor, and the second end of the fourth transistor is connected to the load access end through the fifth resistor; the third end of the fourth transistor is respectively connected to the power supply signal, one end of the seventh resistor and the sixth resistor, the other end of the seventh resistor is connected to the cathode of the third diode, and the anode of the third diode is connected to the third end of the third transistor, wherein the first end includes a gate, the second end includes a drain, and the third end includes a source.

7. The permanent current circuit according to claim 6, characterized in that: When the first control signal is at a high level, the second control signal is at a low level; or, when the first control signal is at a low level, the second control signal is at a high level.

8. The permanent current circuit according to claim 6, characterized in that: The first diode is used to protect the second transistor, the third diode is used to protect the third transistor, and the second diode is used to clamp the indication signal.

9. A high-side driver circuit integrated with a constant current circuit, characterized in that: It comprises a normal power circuit and a high-side driving circuit, wherein the normal power circuit is the normal power circuit according to any one of claims 1 to 8; the normal power circuit is connected to the high-side driving circuit, and the normal power circuit and the high-side driving circuit do not operate at the same time.

10. The high-side driver circuit with integrated constant current circuit according to claim 9, characterized in that: The power supply control module of the normal power circuit is connected to the first control output terminal of the high-side drive circuit, and is used to determine whether to transmit the power supply signal to the load access terminal according to the first control signal output by the first control output terminal; The indication module of the constant power circuit is connected to the second control output terminal of the high-side drive circuit, and is used for: when the power supply control module transmits the power signal to the load access terminal by itself, sending an indication signal to the high-side drive circuit according to the voltage signal of the load access terminal, and maintaining the indication signal according to the second control signal sent by the second control output terminal; when the power supply control module refuses to transmit the power signal to the load access terminal, sending the indication signal to the high-side drive circuit according to the second control signal sent by the second control output terminal; The indication module of the constant power circuit is also connected to the input end of the high-side drive circuit, and is used to send the indication signal to the input end of the high-side drive circuit, so that the high-side drive circuit determines whether it is running according to the indication signal.

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