High-side driving constant electric circuit with current detection and electronic equipment

Abstract

The embodiment of the utility model discloses a constant power circuit for a high-side drive with current detection and electronic equipment, 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 electric circuit comprises a power supply control module which is constructed to determine whether to transmit a power supply signal to a load access end through the constant electric circuit according to a first control signal output by a high-side driving circuit, and the power supply signal is provided by a lithium battery; 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 high-side drive circuit is suitable for high-side drive circuits.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic circuit technical field especially relates to a kind of for the high-side drive of current detection's normal power circuit and electronic equipment. BACKGROUND

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

[0003] Therefore, the utility model embodiment provides a kind of for the high-side drive of current detection's normal power circuit, integrated with normal power circuit high-side drive circuit and electronic equipment, can be maintained high-side drive low-power normal power output without affecting the conventional use of high-side drive circuit, so that the device that requires normal power input works normally.

[0004] In a first aspect, the utility model embodiment provides a kind of for the high-side drive of current detection's normal power circuit, comprising: power supply control module, be configured to determine whether the power signal is transmitted to load access end by itself according to the first control signal output by high-side drive circuit, the power signal is provided by lithium battery;Indication module is connected with the power supply control module, is configured to send indication signal to the high-side drive circuit according to the voltage signal of load access end in the case where the power supply control module transmits the power signal to the load access end 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 runs;The high-side drive circuit is configured to monitor load current of load access end in the case where itself runs, and according to the size relationship between the load current and second threshold, determine the value of the first control signal, the value of the second control signal and determine whether the power signal is transmitted to the load access end by itself;The power supply control module and the high-side drive circuit are not simultaneously used to transmit the power signal to the load access end.

[0005] In an embodiment, the indication module is further 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 in the case where the power supply control module refuses to transmit the power 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 indication 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 indicator signal.

[0012] In a second aspect, the utility model discloses an embodiment further provides a high side drive circuit integrated with a normal power circuit and electronic equipment, including normal power circuit and high side drive circuit, wherein, the normal power circuit is any normal power circuit provided by the embodiment of the utility model, the normal power circuit and the high side drive circuit are connected, and the normal power circuit and the high side drive circuit do not run simultaneously.

[0013] In one embodiment, the power supply control module of the normal power circuit is connected with the first control output end of the high side drive circuit, and is configured 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 with 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 signal to the load access end through itself, send an indication signal to the high side drive circuit according to a 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 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 with 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 run itself according to the indication signal.

[0014] In one embodiment, the high side drive circuit is further configured to, in the case of running itself, monitor a 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 run through the first control signal and the second control signal, and make itself stop running.

[0015] In a third aspect, the utility model discloses an embodiment further provides an electronic equipment, and the electronic equipment includes any high side drive circuit integrated with a normal power circuit provided by the embodiment of the utility model.

[0016] The utility model discloses an embodiment provides a high side drive's normal power circuit for current detection, the high side drive circuit and electronic equipment integrated with normal power circuit, and the power supply control module of normal power circuit can determine whether the power signal is transmitted to the load access end through itself according to the first control signal of high side drive circuit output, to determine whether the load is driven through normal power circuit, and the indication module can transmit the indication signal to the high side drive circuit according to the voltage signal of load access end on one hand under the condition that the power supply control module transmits the power signal to the load access end through itself, and the indication signal is maintained according to the second control signal sent by high side drive circuit on the other hand, so that whether the high side drive circuit runs can be indicated through the indication signal, and whether the high side drive circuit transmits the power signal to the load access end through itself is further determined according to whether the high side drive circuit runs, so that whether the state of driving the load of normal power circuit is switched to the state of driving the load of high side drive circuit can be indicated through the indication signal. Therefore, the normal power circuit for high side drive's current detection provided by the embodiment of the utility model can replace the high side drive circuit to drive the load of low power consumption but long running time to save power consumption, and also can switch the state of driving the load of normal power circuit to the state of driving the load of high side drive circuit according to the need, so that the normal power output of high side drive low power consumption can be maintained without affecting the conventional use of high side drive circuit, to make the equipment of normal work of need normal power input. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, below will be to the embodiment or prior art description needed to use the drawing briefly introduced, obviously, the drawing in the following description only some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, according to these drawings, other drawings can also be obtained.

[0018] Figure 1 A structural schematic diagram of the normal power circuit for high side drive's current detection provided by the embodiment of the utility model is provided.

[0019] Figure 2 A circuit diagram of the normal power circuit for high side drive's current detection provided by the embodiment of the utility model is provided.

[0020] Figure 3 A structural schematic diagram of the high side drive circuit integrated with normal power circuit provided by the embodiment of the utility model is provided.

[0021] Figure 4 Another structural schematic diagram of the high side drive circuit integrated with normal power circuit provided by the embodiment of the utility model is provided. DETAILED DESCRIPTION

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

[0023] It should be clear that the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection 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 low-power high-side driving without 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, and the power supply signal VS is provided by a lithium battery;

[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 utility model provides a high side drive's normal power circuit 1 for current detection, its power supply control module 11 can according to high side drive circuit 2 output's first control signal PC1, determine whether through self transmission power signal VS to load access end OUT, to determine whether through normal power circuit 1 to drive load, indication module 12 can in the case where power supply control module 11 through self transmission power signal VS to load access end OUT, one side according to load access end OUT's voltage signal VOUT, to high side drive circuit 2 sends indication signal IN, the other side according to high side drive circuit 2 sent second control signal PC2 maintains indication signal IN, like this can through indication signal IN indicates whether high side drive circuit 2 is running, and according to whether high side drive circuit 2 is running, further determine whether high side drive circuit 2 through self transmission power signal VS to load access end OUT, like this can through indication signal IN indicates whether the state of normal power circuit 1 drive load is switched to the state of high side drive circuit 2 drive load. Therefore, the embodiment of the utility model provides a high side drive's normal power circuit 1 for current detection can replace high side drive circuit to drive low power consumption but long running time load to save power consumption, also can according to the need state of normal power circuit 1 drive load is switched to the state of high side drive circuit 2 drive load, therefore can be without affecting the conventional use of high side drive circuit while, to maintain high side drive low power consumption normal power output, to make the equipment that needs normal power input normal work

[0029] Specifically, in the embodiment of the utility model, the power signal VS can include various power supply electric signals, such as lithium battery provided electric signal. The output power of power signal VS can be adjusted according to the demand of load, for example, for larger power load, power signal VS can provide larger output power, for smaller power load, power signal VS can provide smaller load. Further, the output voltage of power signal VS can also be adjusted according to the demand of load, the embodiment of the utility model does not make limited to this.

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

[0031] Specifically, in an embodiment of the utility model, power supply control module 11 can determine whether to transmit power signal VS to load access end OUT by itself according to first control signal PC1 output by high side drive circuit 2. Specifically, in an embodiment of the utility model, power supply control module 11 can be configured to transmit power signal VS to load access end OUT in the case of first control signal PC1 being a first control value, or refuse to transmit power signal VS to load access end OUT in the case of first control signal PC1 being 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 the embodiment of the utility model, in the case that power supply control module 11 transmits power signal VS to load access end OUT by itself, indication module 12 can send indication signal IN to high side drive circuit 2 according to the voltage signal VOUT of load access end OUT, that is, the size of the voltage signal VOUT of load access end OUT will affect the value of indication signal IN, and further affect the running state of high side drive circuit 2. In turn, the running state of high side drive circuit 2 will affect the values of first control signal PC1 and second control signal PC2, wherein first control signal PC1 can be used to be applied to power supply control module 11 to control whether power supply control module 11 transmits power signal VS to load access end OUT, and second control signal PC2 can be applied to indication module 12 to maintain the value of indication signal IN.

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

[0034] Specifically, according to whether high side drive circuit 2 is running, the values of first control signal PC1 and second control signal PC2 can be determined, and whether high side drive circuit 2 transmits power signal VS to load access end OUT can also be determined. In an embodiment of the utility model, in the case that high side drive circuit 2 is running, power signal VS can be transmitted to load access end OUT, and in the case that high side drive circuit 2 is not running, power signal VS can be refused to be transmitted to load access end OUT.

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

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

[0037] In another embodiment of the utility model, indication module 12 can also be configured as: in the case that power supply control module 11 transmits power signal VS to load access end OUT by itself, if the difference between power signal VS and voltage signal VOUT of load access end OUT is less than or equal to a first threshold value, then determine that indication signal IN is a second indication value, to indicate high side drive circuit 2 to be prohibited from running according to the second indication value. Wherein, high side drive circuit 2 can determine the value of first control signal PC1 and second control signal PC2 respectively in the case that itself is in the prohibited running state, to make power supply control module 11 transmit power signal VS to load access end OUT according to first control signal PC1, and make indication module 12 maintain indication signal IN as the second indication value according to 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 embodiments introduce 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 embodiments of the present application are 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 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 are not used to 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 embodiments 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 a high level or a low level, and the second control value is the other of the high level or the low level.

[0041] In the embodiment of the utility model, indication module 12 and power supply control module 11 can be realized through various specific circuit elements.

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

[0043] The first end of first transistor T1 is used for connecting second control signal PC2, the second end of first transistor T1 is connected with the first end of second transistor T2 through first resistance R1, and the third end of first transistor T1 is grounded;Wherein, the first end includes gate, the second end includes drain, and the third end includes source;The first end of second transistor T2 is connected with load access end OUT through third resistance R3, the second end of second transistor T2 is connected with one end of fourth resistance R4, the other end of fourth resistance R4 is used for connecting high side drive circuit 2 to send indication signal IN to high side drive circuit 2, the third end of second transistor T2 is connected with power signal VS, and the third end of second transistor T2 is also connected with the second end of first transistor T1 through second resistance R2;Wherein, the first end includes gate, the second end includes drain, and the third end includes source;The positive pole of first diode D1 is connected with the first end of second transistor T2, and the negative pole of first diode D1 is connected with the third end of second transistor T2;The positive pole of second diode D2 is grounded, and the negative pole of second diode D2 is connected with the other end of fourth resistance R4.

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

[0045] The first end of the third transistor T3 is used for connecting a 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 a load access end OUT through the fifth resistor R5; the third end of the fourth transistor T4 is connected with a 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 an 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 example, the first control signal PC1 can be high level, and the second control signal PC2 is low level; in another example, the first control signal PC1 can be low level, and the second control signal PC2 is high level.

[0047] Referring to Figure 2 In the embodiment, the constant power circuit is composed of two PMOS tubes, two NMOS tubes and a plurality of resistors. When the high-side drive circuit 2 is running, the first control signal PC1 is low level, the third transistor T3 is disconnected, the fourth transistor T4 is disconnected, and the voltage signal VS cannot be output to the load access end OUT, that is, the constant power 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 turned on, the first end of the second transistor T2 is low level, so that the second transistor T2 is also turned 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 range required by the high level of the input voltage of the high-side drive 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 enters the state of being supplied by the constant power circuit 1 to the state of being supplied by the high-side drive circuit 2, and the other is that the load access end enters the state of being supplied by the high-side drive circuit 2 to the state of being supplied by the constant power circuit 1.

[0049] Firstly, how the state that the load access end OUT is powered by the normal power 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 normal power 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 turned off, and the power supply signal VS cannot be transmitted to the load access end OUT through the normal power 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 normal power 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 it is needed that the normal power circuit 1 powers 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 normal power 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 utility model, the first diode D1 can be used for protecting the second transistor T2, the third diode D3 can be used for protecting the third transistor T3, and the second diode D2 can be used for clamping the indication signal IN.

[0052] Secondly, the high-side drive circuit 3 integrated with the normal power 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, an indication signal IN, a power supply signal VS, a load access end OUT, and a load resistor ROUT.Figure 3 As shown, in the embodiment of the utility model, the high-side drive circuit 3 integrated with the normal power circuit can include the normal power circuit 1 and the high-side drive circuit 2, wherein the normal power circuit 1 can be any one of the normal power circuits 1 for high-side drive with current detection provided by the foregoing embodiments; the normal power circuit 1 is connected with the high-side drive circuit 2, and the normal power 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 normal power circuit includes any one of the normal power circuits 1 provided by the embodiments of the utility model, the corresponding beneficial technical effects can also be achieved, and the foregoing has been described in detail, which will not be repeated here.

[0054] Specifically, as shown, Figure 4 As shown in one embodiment of the utility model, the power supply control module 11 of the normal power circuit 1 is connected with the first control output end CTR1 of the high-side drive circuit 2, and is used for determining whether the power signal VS is transmitted to the load access end OUT according to the first control signal PC1 output by the first control output end CTR1;

[0055] The indication module 12 of the normal power circuit 1 is connected with the second control output end CTR2 of the high-side drive circuit 2, and is used for: in the case that the power supply control module 11 transmits the power signal VS to the load access end OUT through itself, sending the indication signal IN to the high-side drive circuit 2 according to the voltage signal VOUT of the load access end OUT, and maintaining 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 signal VS to the load access end OUT, sending 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 normal power circuit 1 is also connected with the input end INPUT of the high-side drive circuit 2, and is used for sending 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 one embodiment, the high-side drive circuit 2 is also used for monitoring the load current of the load access end OUT in the case that itself operates, and in the case that the load current is less than the second threshold value, the normal power circuit 1 is operated through the first control signal PC1 and the second control signal PC2, and itself is stopped operating. That is to say, in the case that the load current is too small, the load power consumption is low, and therefore the normal power circuit 1 can be used to supply power to the load.

[0058] Correspondingly, in a third aspect, the embodiments of the utility model also provide an electronic device, the electronic device can include any high side drive circuit integrated with the normal circuit provided by the embodiments of the utility model, therefore, the corresponding technical effects can also be realized, the foregoing has been described in detail, and here is not repeated.

[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 entity or operation, and do not necessarily require or imply these entities or operations have any such actual relationship or order between them. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

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

[0061] Especially, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the part of the method embodiment.

[0062] For the convenience of description, the above device is described as various units / modules respectively described in function. Of course, in the implementation of the utility model, the functions of each unit / module can be realized in the same or multiple software and / or hardware.

[0063] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

Claims

1. A constant-current circuit for high-side drive with current detection, characterized in that, include: The power supply control module is configured to determine whether to transmit a power signal to the load access terminal by itself based on a first control signal output by the high-side drive circuit, wherein the power signal is provided by a lithium battery. An indicator module, connected to the power supply control module, is configured to, when the power supply control module transmits the power signal to the load access terminal, send an indicator signal to the high-side drive circuit based on the voltage signal of the load access terminal, and maintain the indicator signal based on a second control signal sent by the high-side drive circuit; wherein, the indicator signal is used to indicate whether the high-side drive circuit is operating; the high-side drive circuit is configured to, when operating, monitor the load current of the load access terminal, 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 through itself based on the relationship between the load current and a second threshold; the power supply control module and the high-side drive circuit are not used simultaneously to transmit the power signal to the load access terminal.

2. The constant-current circuit according to claim 1, characterized in that, The indicator module is further configured to send the indicator 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 signal to the load access terminal.

3. The constant-current circuit according to claim 1, characterized in that, The power supply control module is configured as follows: When the first control signal is the first control value, the power signal is transmitted to the load access terminal; or, When the first control signal is the second control value, the power signal is refused to be transmitted to the load access terminal, 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.

4. The constant-current circuit according to claim 1, characterized in that, The indicator module is configured as follows: When the power supply control module transmits the power signal to the load access terminal through itself, if the difference between the power signal and the voltage signal of the load access terminal is greater than a first threshold, the indicator signal is determined to be a first indicator value, so as to instruct the high-side drive circuit to operate according to the first indicator value. The high-side drive circuit is configured to determine the values ​​of the first control signal and the second control signal respectively when it is in operation, 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 indicator module maintains the indicator signal at the first indicator value according to the second control signal. or, When the power supply control module transmits the power signal to the load access terminal through 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, the indicator signal is determined to be the second indicator value, so that the high-side drive circuit is disabled according to the second indicator value; The high-side drive circuit is configured to determine the values ​​of the first control signal and the second control signal respectively when it is in a disabled 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 indicator module maintains the indicator signal at the second indicator value according to the second control signal.

5. The constant-current circuit according to claim 1, characterized in that, The indicator 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 terminal of the first transistor is used to connect to the second control signal, the second terminal of the first transistor is connected to the first terminal of the second transistor through the first resistor, and the third terminal of the first transistor is grounded; wherein, the first terminal includes a gate, the second terminal includes a drain, and the third terminal includes a source; The first terminal of the second transistor is connected to the load input terminal through the third resistor. The second terminal 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 driving circuit to send the indication signal to the high-side driving circuit. The third terminal of the second transistor is connected to the power supply signal. The third terminal of the second transistor is also connected to the second terminal of the first transistor through the second resistor. The first terminal includes a gate, the second terminal includes a drain, and the third terminal includes a source. The positive terminal of the first diode is connected to the first terminal of the second transistor, and the negative terminal of the first diode is connected to the third terminal of the second transistor; The positive terminal of the second diode is grounded, and the negative terminal of the second diode is connected to the other end of the fourth resistor.

6. The constant-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 terminal of the third transistor is used to connect to the first control signal. The second terminal of the third transistor is connected in series with the eighth resistor and the sixth resistor, and then connected to the third terminal of the fourth transistor. The third terminal of the third transistor is grounded. The first terminal includes a gate, the second terminal includes a drain, and the third terminal includes a source. The first terminal of the fourth transistor is connected between the eighth resistor and the sixth resistor, and the second terminal of the fourth transistor is connected to the load input terminal through the fifth resistor. The third terminal of the fourth transistor is connected to the power signal, one end of the seventh resistor, and the sixth resistor, respectively. The other end of the seventh resistor is connected to the negative terminal of the third diode, and the positive terminal of the third diode is connected to the third terminal of the third transistor. The first terminal includes a gate, the second terminal includes a drain, and the third terminal includes a source.

7. The constant-current circuit according to claim 6, characterized in that, When the first control signal is high and the second control signal is low; or when the first control signal is low and the second control signal is high.

8. The constant-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 drive circuit integrating a constant-current circuit, characterized in that, It includes a constant power circuit and a high-side drive circuit, wherein the constant power circuit is the constant power circuit according to any one of claims 1 to 8; the constant power circuit and the high-side drive circuit are connected, and the constant power circuit and the high-side drive circuit do not operate simultaneously.

10. The high-side drive circuit integrating a constant-current circuit according to claim 9, characterized in that, The power supply control module of the constant 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 signal to the load access terminal according to the first control signal output by the first control output terminal. The indicator module of the constant power circuit is connected to the second control output terminal of the high-side drive circuit, and is used to: when the power supply control module transmits the power signal to the load access terminal through itself, send an indicator signal to the high-side drive circuit according to the voltage signal of the load access terminal, and maintain the indicator 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, send the indicator signal to the high-side drive circuit according to the second control signal sent by the second control output terminal. The indicator module of the constant power circuit is also connected to the input terminal of the high-side drive circuit, and is used to send the indicator signal to the input terminal of the high-side drive circuit so that the high-side drive circuit can determine whether it is running based on the indicator signal.

11. The high-side drive circuit integrating a constant-current circuit according to claim 10, characterized in that, The high-side drive circuit is used to monitor the load current at the load access terminal while it is running. If the load current is less than a second threshold, it enables the constant power circuit to run through the first control signal and the second control signal, and stops running itself.

12. An electronic device, characterized in that, The electronic device includes a high-side drive circuit with a constant-current circuit integrated as described in any one of claims 9 to 11.

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