CN111146761A - High-side switch circuit with grounding loss protection function - Google Patents
High-side switch circuit with grounding loss protection function Download PDFInfo
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- CN111146761A CN111146761A CN202010123202.0A CN202010123202A CN111146761A CN 111146761 A CN111146761 A CN 111146761A CN 202010123202 A CN202010123202 A CN 202010123202A CN 111146761 A CN111146761 A CN 111146761A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/14—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to occurrence of voltage on parts normally at earth potential
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Abstract
A high-side switch circuit with a grounding loss protection function comprises a grounding loss protection circuit, a reset circuit, a high-side switch driving circuit and a high-side switch. The output end of the high-side switch driving circuit is connected with the control end of the high-side switch; the high side switch is a semiconductor switching device. The grounding loss protection circuit is provided with a power supply end, a reference end, an output end and a reset end, wherein the power supply end and the reference end of the grounding loss protection circuit are respectively connected with the power supply end and the reference end of the high-side switch driving circuit, the output end of the grounding loss protection circuit is connected with the control end of the high-side switch driving circuit, and the reset end of the grounding loss protection circuit is connected with the output end of the reset circuit. The grounding loss protection circuit outputs a turn-off control signal to the high-side switch driving circuit when the high-side switch circuit is in grounding loss so as to turn off the high-side switch. The invention can prevent the high-side switch from working in a linear area when the high-side switch circuit is in ground loss.
Description
Technical Field
The invention relates to a high-side switching circuit.
Background
High-side switching circuits have been widely used in the automotive field due to their advantages in reducing short-circuit hazards, reducing system cost, preventing galvanic corrosion, etc.
Fig. 1 shows a functional block diagram of a battery charging system employing a high-side switching circuit. As shown in fig. 1, the input terminal of the high-side switch circuit 92 is connected to the output terminal of the DC/DC converter 91, the output terminal of the high-side switch circuit 92 is connected to the positive electrode of the battery 93, and the high-side switch circuit 92 may be a semiconductor switch, an electromagnetic relay, or the like. In one specific application, the DC/DC converter 91 is an on-board DC converter, the output of which is defined as KL30, and the positive terminal of the battery 92 is defined as KL 30Z. The DC/DC converter 91, the high-side switching circuit 92, the negative electrode of the battery 93, the first load 94, and the second load 95 are all connected to a vehicle body ground point (i.e., grounded).
The internal principle of the high-side switching circuit shown in fig. 1 is shown in fig. 2. The high-side switch circuit 92 includes a charge pump or boost circuit 921, a high-side switch 922, a high-side switch drive circuit 923, and a controller 924. The high-side switch 922 uses an NMOS transistor. The high-side switch circuit is powered by KL30 or KL30Z, the charge pump or the boost circuit 921 is used for providing voltage capable of driving the high-side switch 922, the controller 924 sends a control signal VC to the high-side switch driving circuit 923 through the sampled monitoring signal, and the high-side switch 922 is controlled by the high-side switch driving circuit 923.
In a high-side switch circuit using a semiconductor switch device as a high-side switch, since a reference ground of the high-side switch circuit is usually connected with a vehicle body reference ground through a connector, there is a risk that the high-side switch circuit is easily dropped and lost in an automobile running environment or a connection failure with the vehicle body reference ground due to human operation errors. Once the ground is lost, the high side switching circuit 92 is in a floating state. The high-side switch circuit 92 is equivalent to an adjustable resistor, at this time, an equivalent circuit of the battery charging system is as shown in fig. 3, KL30 is connected in series to KL30Z through a first path impedance Z1 and a second path impedance Z2 inside a product, the first path impedance Z1 and the second path impedance Z2 are connected in series and then connected in parallel with the high-side switch 922, so that the drive of the high-side switch 922 is easily uncontrollable, and a semiconductor switching device serving as the high-side switch is easily caused to work in a linear region.
Disclosure of Invention
The present invention is directed to a high-side switch circuit having a ground loss protection function, which can prevent a high-side switch formed of a semiconductor switching device from operating in a linear region when a ground loss occurs in the high-side switch circuit.
The embodiment of the invention provides a high-side switch circuit with a grounding loss protection function, which comprises a high-side switch driving circuit and a high-side switch, wherein the output end of the high-side switch driving circuit is connected with the control end of the high-side switch; the high-side switch is a semiconductor switch device; the high-side switch circuit also comprises a grounding loss protection circuit and a reset circuit; the grounding loss protection circuit is provided with a power supply end, a reference end, an output end and a reset end, wherein the power supply end and the reference end of the grounding loss protection circuit are respectively connected with the power supply end and the reference end of the high-side switch driving circuit; the grounding loss protection circuit is used for outputting a turn-off control signal to the high-side switch driving circuit when the high-side switch circuit is in grounding loss so as to enable the high-side switch driving circuit to turn off the high-side switch and disable the high-side switch when the high-side switch driving circuit is reset by the reset circuit.
The invention has at least the following technical effects:
the high-side switch circuit of the embodiment of the invention is provided with the grounding loss protection circuit, and the grounding loss protection circuit outputs a turn-off control signal to the high-side switch driving circuit when the high-side switch circuit is in grounding loss, so that the high-side switch driving circuit turns off the high-side switch, thereby avoiding the situation that the high-side switch formed by semiconductor switch devices enters a linear working area.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 shows a functional block diagram of a battery charging system employing a high-side switching circuit.
Fig. 2 shows a circuit schematic of a high-side switching circuit.
Fig. 3 shows an equivalent circuit schematic of the battery charging system when the high-side switching circuit ground is lost.
Fig. 4 shows a circuit schematic of a high-side switching circuit according to an embodiment of the invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Please refer to fig. 4. The high-side switch circuit with the ground loss protection function according to the embodiment of the invention comprises a ground loss protection circuit 1, a reset circuit 2, a high-side switch driving circuit 3 and a high-side switch 4.
The output end of the high-side switch driving circuit 3 is connected with the control end of a high-side switch 4, and the high-side switch 4 is a semiconductor switch device. In this embodiment, the high-side switch is an NMOS transistor, and the gate of the NMOS transistor constitutes the control terminal of the high-side switch 4.
The ground loss protection circuit 1 has a supply terminal P1, a reference terminal N1, an output terminal, and a reset terminal. The power supply end P1 and the reference end N1 of the ground loss protection circuit 1 are respectively connected with the power supply end P0 and the reference end N0 of the high-side switch driving circuit 3, the output end of the ground loss protection circuit 1 is connected with the control end of the high-side switch driving circuit 3, and the reset end of the ground loss protection circuit 1 is connected with the output end of the reset circuit 2. The ground loss protection circuit 1 is configured to output a turn-off control signal to the high-side switch driving circuit when the high-side switch circuit is in ground loss, so that the high-side switch driving circuit turns off the high-side switch, and is disabled when being reset by the reset circuit 2, and the ground loss protection circuit 1 stops outputting the turn-off control signal when disabled, thereby removing the protection function of the ground loss protection circuit 1.
The ground loss protection circuit comprises a voltage regulator tube ZD1, a capacitor C1, a diode D2, a switch tube Q1, a switch tube Q2 and a switch tube Q3.
The negative electrode of the voltage regulator tube ZD1 and the first end of the switch tube Q2 are respectively connected with the power supply end P1 of the grounding loss protection circuit, and the positive electrode of the voltage regulator tube ZD1 is connected with the control end of the switch tube Q1; the first end of the switching tube Q1 is connected with the power supply end P1 of the ground loss protection circuit, the first end of the capacitor C1, the second end of the switching tube Q2 and the control end of the switching tube Q3 respectively; the first end of the switch tube Q3 is respectively connected with the power supply end P1 of the ground loss protection circuit, the control end of the switch tube Q2 and the cathode of the diode D2; the second end of the switch tube Q1, the second end of the capacitor C1 and the second end of the switch tube Q3 are respectively connected with the reference end of the ground loss protection circuit; the anode of the diode D2 is connected to the control terminal of the high-side switch driving circuit 3, and the anode of the diode D2 constitutes the output terminal of the ground loss protection circuit 1.
The output end of the reset circuit 2 is connected to the common node of the first end of the capacitor C1, the second end of the switch tube Q2 and the control end of the switch tube Q3, and the common node of the first end of the capacitor C1, the second end of the switch tube Q2 and the control end of the switch tube Q3 constitutes the reset end of the ground loss protection circuit 1.
When the high-side switching circuit is not grounded, the voltage regulator tube ZD1 and the switching tube Q1 are conducted, the reset circuit establishes a discharge path for the capacitor C1 to discharge the capacitor C1, and the switching tube Q3, the switching tube Q2 and the diode D2 are cut off; when the high-side switching circuit is lost, the voltage regulator tube ZD1 and the switching tube Q1 are turned off, and the switching tube Q3, the switching tube Q2 and the diode D2 are turned on.
Further, the ground loss protection circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, and a resistor R10. The first ends of the resistor R1, the resistor R2, the resistor R4 and the resistor R10 are connected with a power supply end P1 of the ground loss protection circuit, the second end of the resistor R1 is connected with the negative electrode of a voltage regulator tube ZD1, the second end of the resistor R2 is respectively connected with the first end of the switch tube Q1 and the first end of the capacitor C1, the second end of the resistor R4 is connected with the first end of the switch tube Q2, and the second end of the resistor R10 is connected with the common joint of the control end of the switch tube Q2, the negative electrode of the diode D2 and the first end of the switch tube Q3; the first end of the resistor R3 is respectively connected with the anode of the voltage regulator tube ZD1 and the control end of the switch tube Q1, and the second end of the resistor R3 is connected with the reference end of the ground loss protection circuit.
Optionally, the ground loss protection circuit includes a diode D1, an anode of the diode D1 is connected to the second terminal of the resistor R2 and the first terminal of the switch Q1, and a cathode of the diode D1 is connected to the first terminal of the capacitor C1. The diode D1 is provided to stabilize the voltage of the capacitor C1.
In this embodiment, the switching tube Q1 and the switching tube Q3 are both NPN triodes, and the control end, the first end and the second end of the switching tube Q1 and the switching tube Q3 are respectively a base, a collector and an emitter of the NPN triode; the switching tube Q2 is a PNP triode, and the control end, the first end and the second end of the switching tube Q2 are respectively a base electrode, an emitting electrode and a collector electrode of the PNP triode. In other embodiments, the switching transistors Q1 and Q3 are NMOS transistors, and the switching transistor Q2 is a PMOS transistor.
The reset circuit comprises a switching tube Q7 and a switching tube Q6; the control end of the switching tube Q7 is used for receiving a switching control signal Vrst input from the outside, the first end of the switching tube Q7 is connected with the control end of the switching tube Q6, and the second end of the switching tube Q7 is grounded; the first end of the switching tube Q6 is connected with the reset end of the ground loss protection circuit 1, and the second end of the switching tube Q6 is connected with the reference end of the high-side switch driving circuit. When the high-side switching circuit is not in ground loss, the switching tube Q7 and the switching tube Q6 are conducted, and when the high-side switching circuit is in ground loss, the ground of the reset circuit is lost, and the switching tube Q7 and the switching tube Q6 are turned off.
Further, the reset circuit includes a resistor R7, a resistor R8, and a resistor R9; two ends of the resistor R7 are respectively connected with the first end of the switch tube Q6 and the control end of the switch tube Q6, two ends of the resistor R8 are respectively connected with the control end of the switch tube Q6 and the first end of the switch tube Q7, one end of the resistor R9 is connected with the control end of the switch tube Q7, and the other end of the resistor R9 is used for receiving an externally input switch control signal Vrst.
In this embodiment, the switching tube Q7 is an NPN transistor, and the control end, the first end, and the second end of the switching tube Q7 are a base, a collector, and an emitter of the NPN transistor, respectively; the switching tube Q6 is a PNP triode, and the control end, the first end and the second end of the switching tube Q6 are respectively a base electrode, an emitting electrode and a collector electrode of the PNP triode. In another embodiment, the switching transistor Q7 is an NMOS transistor, and the switching transistor Q6 is a PMOS transistor.
The high-side switch driving circuit 3 comprises a push-pull circuit, the input end of the push-pull circuit is connected with the output end of the grounding loss protection circuit 1, and the output end of the push-pull circuit is connected with the control end of the high-side switch.
The push-pull circuit comprises a switch tube Q4, a switch tube Q5, a resistor R5, a resistor R6 and a voltage regulator tube ZD 2; the first end of the switch tube Q4 and one end of the resistor R5 are both connected with a power supply end P0 of the high-side switch driving circuit, the control end of the switch tube Q4 is connected with the output end of the ground loss protection circuit, the second end of the resistor R5, the cathode of the voltage regulator tube ZD2 and the control end of the switch tube O5, the second end of the switch tube Q4 is connected with the first end of the switch tube Q5, the first end of the resistor R6 is connected with the common connection point of the second end of the switch tube Q4 and the first end of the switch tube Q5, the second end of the resistor R6 is connected with the control end of the high-side switch, and the anode of the voltage regulator tube ZD2 and the second end of the switch tube Q5 are both connected with the reference end N0 of the high-side.
The high-side switch driving circuit further comprises a resistor R19 and a switch tube Q8, wherein a first end of the resistor R19 is connected to a common junction point of a control end of the switch tube Q4 and a control end of the switch tube O5, a second end of the resistor R19 is connected with a first end of the switch tube Q8, a second end of the switch tube Q8 is grounded, and the control end of the switch tube Q8 is used for receiving an externally input control signal Vc.
In this embodiment, the switching tube Q4 is an NPN transistor, and the control end, the first end, and the second end of the switching tube Q4 are a base, a collector, and an emitter of the NPN transistor, respectively; the switching tube Q5 is a PNP triode, and the control end, the first end and the second end of the switching tube Q5 are respectively a base electrode, an emitting electrode and a collector electrode of the PNP triode; the switch tube Q8 is an NMOS tube, and the control end, the first end and the second end of the switch tube Q8 are the gate, the drain and the source of the NMOS tube, respectively. In another embodiment, the switching transistor Q4 is an NMOS transistor, and the switching transistor Q5 is a PMOS transistor. The switching tube Q8 is an NPN transistor.
In one particular application, the high-side switching circuit is used in a battery charging system for an automobile. The input end of the high-side switch circuit is connected with the output end (KL30) of the vehicle-mounted direct-current converter, the output end of the high-side switch circuit is connected with the positive electrode (KL30Z) of the battery, the voltage of the first end of the high-side switch 4 is KL30, the voltage of the second end of the high-side switch 4 is KL30Z, the voltage of the power supply end P0 of the high-side switch driving circuit 3 is Vsup, the voltage Vsup is the output voltage of the charge pump or the booster circuit, and the voltage of the reference end N0 of the high-side switch driving circuit 3 is KL 30Z.
Under the normal working condition, the grounding of the high-side switching circuit is not lost, the voltages Vsup and KL30Z are added on a series branch of a resistor R1, a voltage-regulator tube ZD1 and a resistor R3, the voltage-regulator tube ZD1 works in a voltage-regulated mode, a switching tube Q1 is conducted, and current flows through the voltage-regulator tube ZD1 and flows through the base electrode and the emitter electrode of the switching tube Q1. Meanwhile, under the condition that the ground is not lost, the singlechip or the FPGA sends a switch control signal Vrst signal to the switch tube Q7, so that the switch tube Q6 is switched on, the capacitor C1 is discharged, and the reset effect is achieved. The voltage of the capacitor C1 after being discharged by the reset circuit 2 is 0, the voltage of the junction of the base electrode and the emitter electrode of the switching tube Q3 is 0, the switching tube Q3 is turned off and cut off, the cathode of the diode D2 is pulled high to Vsup, and the diode D2 is in a turned-off and cut-off state. If the control signal Vc is at a low level, the output of the high-side switch driving circuit 3 is at a high level, and the high-side switch 4 is turned on, and if the control signal Vc is at a high level, the output of the high-side switch driving circuit 3 is at a low level, and the high-side switch 4 is turned off.
Under the condition of abnormal working, the grounding of the high-side switching circuit is lost, the voltage Vsup is reduced, the voltage difference between the Vsup and the KL30Z is reduced, the voltage applied to the voltage regulator tube ZD1 is not enough to generate enough current, the voltage regulator tube ZD1 is cut off, no current flows through the base electrode of the switching tube Q1, the switching tube Q1 is cut off, the reset circuit 2 does not work, the voltage Vsup charges the capacitor C1 through the resistor R2 and the diode D1, the voltage is established so that the base electrode and the emitter electrode of the switching tube Q3 have certain voltage drop, the switching tube Q3 is conducted, the base electrode voltage of the switching tube Q2 is pulled to the KL30Z, the emitter electrode and the base electrode of the switching tube Q2 generate voltage drop, the switching tube Q2 is conducted, the Vsup continuously charges the capacitor C1 through the resistor R4 and the switching tube Q2, the diode D2 is conducted, the output end voltage of the grounding loss protection circuit 1 is pulled to the KL30Z through the diode D2 Vp 42, so that the high-side switching circuit.
The high-side switch circuit of the embodiment can turn off the high-side switch by short-circuiting Z2 or reducing the impedance of Z2 under the condition that the vehicle-mounted direct-current converter charges the battery through the high-side switch circuit, thereby avoiding the condition that the high-side switch enters a linear working area.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A high-side switch circuit with a grounding loss protection function comprises a high-side switch driving circuit and a high-side switch, wherein the output end of the high-side switch driving circuit is connected with the control end of the high-side switch; the high-side switch is a semiconductor switch device; the high-side switch circuit is characterized by further comprising a grounding loss protection circuit and a reset circuit;
the grounding loss protection circuit is provided with a power supply end, a reference end, an output end and a reset end, wherein the power supply end and the reference end of the grounding loss protection circuit are respectively connected with the power supply end and the reference end of the high-side switch driving circuit;
the grounding loss protection circuit is used for outputting a turn-off control signal to the high-side switch driving circuit when the high-side switch circuit is in grounding loss so as to enable the high-side switch driving circuit to turn off the high-side switch and disable the high-side switch when the high-side switch driving circuit is reset by the reset circuit.
2. The high-side switch circuit according to claim 1, wherein the ground loss protection circuit comprises a voltage regulator tube ZD1, a capacitor C1, a diode D2, a switch tube Q1, a switch tube Q2 and a switch tube Q3;
the negative electrode of the voltage regulator tube ZD1 and the first end of the switch tube Q2 are respectively connected with the power supply end of the grounding loss protection circuit, and the positive electrode of the voltage regulator tube ZD1 is connected with the control end of the switch tube Q1; the first end of the switching tube Q1 is connected with the power supply end of the ground loss protection circuit, the first end of the capacitor C1, the second end of the switching tube Q2 and the control end of the switching tube Q3 respectively; the first end of the switching tube Q3 is respectively connected with the power supply end of the grounding loss protection circuit, the control end of the switching tube Q2 and the cathode of the diode D2; the second end of the switch tube Q1, the second end of the capacitor C1 and the second end of the switch tube Q3 are respectively connected with the reference end of the ground loss protection circuit; the anode of the diode D2 is connected with the control end of the high-side switch driving circuit;
the output end of the reset circuit is connected to the common junction point of the first end of the capacitor C1, the second end of the switch tube Q2 and the control end of the switch tube Q3;
when the high-side switching circuit is not grounded, the voltage regulator tube ZD1 and the switching tube Q1 are conducted, the reset circuit establishes a discharge path for the capacitor C1 to discharge the capacitor C1, and the switching tube Q3, the switching tube Q2 and the diode D2 are cut off;
when the high-side switching circuit is lost, the voltage regulator tube ZD1 and the switching tube Q1 are turned off, and the switching tube Q3, the switching tube Q2 and the diode D2 are turned on.
3. The high-side switch circuit of claim 2, wherein the ground loss protection circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, and a resistor R10;
the first ends of the resistor R1, the resistor R2, the resistor R4 and the resistor R10 are connected with the power supply end of the ground loss protection circuit, the second end of the resistor R1 is connected with the negative electrode of the voltage regulator tube ZD1, the second end of the resistor R2 is connected with the first end of the switch tube Q1 and the first end of the capacitor C1 respectively, the second end of the resistor R4 is connected with the first end of the switch tube Q2, and the second end of the resistor R10 is connected with the common connection point of the control end of the switch tube Q2, the negative electrode of the diode D2 and the first end of the switch tube Q3; the first end of the resistor R3 is respectively connected with the anode of the voltage regulator tube ZD1 and the control end of the switch tube Q1, and the second end of the resistor R3 is connected with the reference end of the ground loss protection circuit.
4. The high-side switch circuit according to claim 3, wherein the ground loss protection circuit comprises a diode D1, wherein an anode of a diode D1 is connected to the second terminal of the resistor R2 and the first terminal of the switch tube Q1, respectively, and a cathode of a diode D1 is connected to the first terminal of the capacitor C1.
5. The high-side switching circuit according to claim 2, wherein the switching transistor Q1 and the switching transistor Q3 are NPN transistors, and the control terminal, the first terminal and the second terminal of the switching transistor Q1 and the switching transistor Q3 are base, collector and emitter of the NPN transistor, respectively;
the switching tube Q2 is a PNP triode, and the control end, the first end and the second end of the switching tube Q2 are respectively a base electrode, an emitting electrode and a collector electrode of the PNP triode.
6. The high-side switch circuit according to any one of claims 1 to 5, wherein the reset circuit comprises a switch tube Q7 and a switch tube Q6; the control end of the switching tube Q7 is used for receiving an externally input switching control signal, the first end of the switching tube Q7 is connected with the control end of the switching tube Q6, and the second end of the switching tube Q7 is grounded; a first end of a switch tube Q6 is connected with a reset end of the grounding loss protection circuit, and a second end of a switch tube Q6 is connected with a reference end of the high-side switch driving circuit;
when the high-side switching circuit is not in ground loss, the switching tube Q7 and the switching tube Q6 are conducted, and when the high-side switching circuit is in ground loss, the switching tube Q7 and the switching tube Q6 are turned off.
7. The high-side switch circuit of claim 6, wherein the reset circuit comprises a resistor R7, a resistor R8, and a resistor R9; two ends of the resistor R7 are respectively connected with the first end of the switch tube Q6 and the control end of the switch tube Q6, two ends of the resistor R8 are respectively connected with the control end of the switch tube Q6 and the first end of the switch tube Q7, one end of the resistor R9 is connected with the control end of the switch tube Q7, and the other end of the resistor R9 is used for receiving an externally input switch control signal;
the switching tube Q7 is an NPN triode, and the control end, the first end and the second end of the switching tube Q7 are respectively a base electrode, a collector electrode and an emitter electrode of the NPN triode;
the switching tube Q6 is a PNP triode, and the control end, the first end and the second end of the switching tube Q6 are respectively a base electrode, an emitting electrode and a collector electrode of the PNP triode.
8. The high-side switch circuit according to claim 1, wherein the high-side switch driving circuit comprises a push-pull circuit, an input terminal of the push-pull circuit is connected with an output terminal of the ground loss protection circuit, and an output terminal of the push-pull circuit is connected with a control terminal of the high-side switch.
9. The high-side switch circuit according to claim 8, wherein the push-pull circuit comprises a switch tube Q4, a switch tube Q5, a resistor R5, a resistor R6 and a voltage regulator tube ZD 2; the first end of a switch tube Q4 and one end of a resistor R5 are both connected with the power supply end of the high-side switch driving circuit, the control end of a switch tube Q4 is respectively connected with the output end of the ground loss protection circuit, the second end of the resistor R5, the cathode of a voltage regulator tube ZD2 and the control end of a switch tube O5, the second end of a switch tube Q4 is connected with the first end of a switch tube Q5, the first end of the resistor R6 is connected with the common joint point of the second end of a switch tube Q4 and the first end of the switch tube Q5, and the second end of the resistor R6 is connected with the control end of the high-side switch; the anode of the voltage regulator tube ZD2 and the second end of the switch tube Q5 are both connected with the reference end of the high-side switch driving circuit;
the high-side switch driving circuit further comprises a resistor R19 and a switch tube Q8, wherein a first end of the resistor R19 is connected to a common junction point of a control end of the switch tube Q4 and a control end of the switch tube O5, a second end of the resistor R19 is connected with a first end of the switch tube Q8, a second end of the switch tube Q8 is grounded, and the control end of the switch tube Q8 is used for receiving an externally input control signal.
10. The high-side switch circuit of claim 1, wherein the high-side switch is an NMOS transistor, and a gate of the NMOS transistor forms a control terminal of the high-side switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010123202.0A CN111146761A (en) | 2020-02-27 | 2020-02-27 | High-side switch circuit with grounding loss protection function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010123202.0A CN111146761A (en) | 2020-02-27 | 2020-02-27 | High-side switch circuit with grounding loss protection function |
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| CN111146761A true CN111146761A (en) | 2020-05-12 |
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| CN202010123202.0A Pending CN111146761A (en) | 2020-02-27 | 2020-02-27 | High-side switch circuit with grounding loss protection function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117811558A (en) * | 2024-03-01 | 2024-04-02 | 东方久乐汽车电子（上海）股份有限公司 | High-side driving circuit, control method thereof and vehicle |
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2020
- 2020-02-27 CN CN202010123202.0A patent/CN111146761A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117811558A (en) * | 2024-03-01 | 2024-04-02 | 东方久乐汽车电子（上海）股份有限公司 | High-side driving circuit, control method thereof and vehicle |
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