TW202226722A - High side and low side driving system - Google Patents

Abstract

The present invention provides a high-side and low-side driving system, which includes a high-end control module and a low-end control module. The high-end control module includes a voltage stabilizing unit arranged on the input side of the high-end voltage, and a current trigger connected to the output of the voltage stabilizing unit. The low-end control module includes a buck module connected to the current trigger, a constant current trigger connected in series between the buck module and the ground terminal, and an input connected to the voltage stabilizing unit and The output is connected to the low-side constant current source of the ground terminal. The reference voltage source of the current trigger and the low-end constant current source are commonly connected to the floating ground so that the reference voltage changes in accordance with the floating ground. When the constant current trigger receives the first control signal, a traction current is generated through the current trigger to change the comparison voltage and output a second control signal.

Description

High and low end drive system

The present invention relates to a high- and low-end drive system, in particular to a high and low-end drive system that does not require a pressurized lifting circuit.

The basic task of the drive circuit is to convert the signal from the information electronic circuit into a signal added between the control terminal and the common terminal of the power electronic device to turn it on or off according to the requirements of its control target. For half-controlled devices, only turn-on control signals are required, while for fully-controlled devices, both turn-on control signals and turn-off control signals are required to ensure reliable turn-on or turn-off of the device as required.

Generally in the circuit, the low-side circuit (low side) refers to the grounding of the MOSFET, and the drive signal is a device based on the ground signal. There is no need to add a voltage boost circuit in the drive circuit. If it is a high-side circuit (high side) For driving, since the driving signal is floating, a voltage boosting circuit is required to send the voltage of the low-side voltage to the high-side circuit, so as to control the action of the high-side circuit device.

The main purpose of the present invention is to provide a high- and low-end drive system, which includes a high-end control module and a low-end control module. The high-side control module includes a voltage-stabilizing unit disposed on the input side of the high-side voltage, and a current trigger connected to the output of the voltage-stabilizing unit. The low-end control module includes a step-down module connected to the current trigger, a constant-current trigger connected in series between the step-down module and the ground, and an input connected to the voltage regulator unit and A low-side constant current source with the output connected to this ground. The reference voltage source of the current trigger and the input terminal of the low-end constant current source are jointly connected to a floating ground so that the reference voltage changes with the floating ground, and the constant current trigger generates a The pulling current passes through the current trigger to change the comparison voltage, and the current trigger outputs a second control signal when detecting that the comparison voltage is changed relative to the reference voltage.

Further, the voltage regulator unit includes a voltage regulator connected to the input side of the high-side voltage, and a capacitor connected to the output of the voltage regulator.

Further, the regulator is a linear regulator or a switching regulator.

Further, the current trigger includes a comparator, a first current source whose input is connected to the capacitor and whose output is connected to the comparator, and a load unit connected in series between the first current source and the step-down module . The first input terminal of the comparator is connected between the output of the first current source and the input of the load unit, the second input terminal of the comparator is connected to the reference voltage source, and one end of the reference voltage source is connected to the The floating ground changes the reference voltage in coordination with the floating ground. The constant current trigger includes a switch controller that is turned on or off according to the first control signal, and a second current source connected in series to the switch controller, and the passing current of the second current source is greater than the first current The through current of the source, when the switch controller is turned on, changes the node voltage of the first input end of the comparator through the first current source and the second current source in series, and switches the output of the comparator to output by changing the node voltage the second control signal.

Further, the step-down module includes one or more transistor switches disposed between the current trigger and the constant current trigger.

Therefore, the low-end device of the present invention can output a control signal to the high-end device without requiring a pressurized lift circuit when instructing the high-end device to perform work. On the other hand, the present invention has lower cost and market competitiveness compared with the conventional device using the pressurized lifting circuit.

The detailed description and technical content of the present invention are described below with reference to the drawings. Furthermore, the drawings in the present invention are not necessarily drawn according to the actual scale for the convenience of description, but may be exaggerated, and the drawings and their proportions are not intended to limit the scope of the present invention.

The low-side device (Low Side) described in the present invention specifically refers to a device in which one end of the circuit is directly connected to the ground, and the high-side device (High Side) described in the present invention specifically refers to the circuit at either end Devices not connected to ground are described here.

One embodiment of the present invention will be described below. Please refer to FIG. 1 and FIG. 2 together, which are a block diagram and a circuit diagram of a high- and low-end driving system of the present invention, as shown in the figures.

This embodiment discloses a high- and low-end driving system 100 . The high- and low-end driving system 100 includes a high-end control module 10 and a low-end control module 20 . The high-side control module 10 is disposed between the high-side voltage input side HI and the floating ground FG; the low-side control module 20 is disposed between the floating ground FG and the ground terminal Gnd (low-side voltage output side). In this embodiment, although the high-end control module 10 is directly connected to the high-voltage output end of the power supply device PS, the configuration is only one of the possible embodiments of the present invention, and the high-end control module 10 of the present invention can be configured with Any position on the circuit that is not connected to the ground terminal Gnd will be described here first.

The high-side control module 10 includes a voltage-stabilizing unit 11 disposed on the high-side voltage input side HI, and a current trigger 12 connected to the output of the voltage-stabilizing unit 11 . The output of the current trigger 12 is connected or coupled to a first controller CPU1 for outputting a first control signal to the first controller CPU1.

In one embodiment, the voltage regulator unit 11 includes a voltage regulator 111 connected to the high-side voltage input side HI, and a capacitor 112 connected to the output of the voltage regulator 111 . In one embodiment, the regulator 111 may be a linear regulator or a switching regulator, which is not limited in the present invention.

In one embodiment, the current flip-flop 12 includes a comparator 121, a first current source 122 whose input is connected to the capacitor 112 and whose output is connected to the comparator 121, and a first current source 122 and a The load unit 123 between the step-down modules 21 . The first input terminal 121A of the comparator 121 is connected between the output of the first current source 122 and the input of the load unit 123, the second input terminal 121B of the comparator 121 is connected to the reference voltage source 124, the reference One end of the voltage source 124 is connected to the floating ground FG for changing the reference voltage in cooperation with the floating ground FG.

The low-end control module 20 includes a step-down module 21 connected to the current trigger 12, a constant-current trigger 22 connected in series between the step-down module 21 and the ground terminal Gnd, and an input The low-end constant current source 23 is connected to the voltage regulator unit 11 and the output is connected to the ground terminal Gnd. The input of the constant current flip-flop 22 is connected or coupled to a second controller CPU2, and the constant current flip-flop 22 is switched on and off according to the signal output by the second controller CPU2.

In one embodiment, the step-down module 21 includes one or more transistor switches disposed between the current trigger 12 and the constant current trigger 22 . In another embodiment, the step-down module 21 may be a buck converter (Buck Converter), a low-dropout regulator (LDO) or other such devices, which are not used in the present invention. limit.

In one embodiment, the constant current trigger 22 includes a switch controller 221 that is turned on or off according to the first control signal, and a second current source 222 connected to the switch controller 221 in series. In order to control the node voltage of the first input terminal 121A, the passing current of the second current source 222 is greater than the passing current of the first current source 122 . When the switch controller 221 is turned on, the node voltage of the first input terminal 121A of the comparator 121 is changed through the first current source 122 and the second current source 222 connected in series, and the voltage of the comparator 121 is switched by changing the node voltage. output to output the second control signal to the first controller CPU1.

Please refer to "FIG. 3" and "FIG. 4" together, which are the working schematic diagram (1) and the working schematic diagram (2) of the high-end and low-end driving system of the present invention, as shown in the figures.

Please refer to FIG. 3 first. In the first state (for example, the constant state), the constant current trigger 22 is in an off state. At this time, the low-end constant current source 23 charges the capacitor 112, and the floating ground FG cooperates with The low-side constant current source 23 is adjusted to a floating voltage level Vfg1; at this time, since the reference voltage source 124 of the current flip-flop 12 and the input terminals of the low-side constant current source 23 are both connected to the floating ground FG, therefore The reference voltage Vin1 is changed in accordance with the floating ground FG (Vin1=Vref+Vfg1), in accordance with the settings of the capacitor 112 and the current source 122, the node voltage Vin2 is the capacitor 112 (capacitor voltage Vca) and the first current source 122 (current source voltage Vcu1) and the sum of the floating ground FG voltages (Vin2=Vca+Vcu1+Vfg1), the node voltage Vin2 of the first input terminal 121A may be, for example, less than the reference voltage Vin1, at this time the current trigger 12 (comparator 121) A first signal (eg 0 or 1) is output. Since the reference voltage source 124 of the current flip-flop 12 and the input terminals of the low-end constant current source 23 are commonly connected to the floating ground FG, no matter how much the voltage of the floating ground FG changes, the reference voltage Vin1 and the node voltage Vin2 will both be When the voltage Vref of the reference voltage source 124 and the capacitor voltage Vca and the current source voltage Vcu1 are all controllable, the sum of the capacitor voltage Vca and the current source voltage Vcu1 can be configured to be smaller than the reference voltage source. 124 to ensure that the node voltage Vin2 is lower than the reference voltage Vin1 in the first state.

Continuing, please refer to “FIG. 4”, in the second state, the constant current trigger 22 receives the first control signal CS1, at this time the constant current trigger 22 turns on the switch, and the second current source 222 is connected in series to the On the loop of the first current source 122 ; since the second current source 222 is larger than the first current source 122 , the constant current trigger 22 will generate a pulling current C1 through the current trigger 12 to change the first current source 122 The current source voltage of the first current source 122 is changed from Vcu1 to Vcu2, thereby changing the comparison voltage. When the current trigger 12 detects that the comparison voltage is changed relative to the reference voltage, it outputs a second signal (the second signal). Control signal CS2) (opposite to the first signal; for example, if the first signal is 0, the second signal is 1; if the first signal is 1, the second signal is 2). Similarly, since the reference voltage source 124 of the current flip-flop 12 and the input terminal of the low-end constant current source 23 are both connected to the floating ground FG, the reference voltage Vin3 will be the voltage Vref of the reference voltage source 124 and the floating voltage. The sum of the levels Vfg2 (Vin3=Vref+Vfg2), the node voltage Vin4 (comparison voltage) will be the sum of the capacitor voltage Vca, the current source voltage Vcu2 and the floating voltage level Vfg2 (Vin4=Vca+Vcu2+Vfg2); When the voltage level Vfg2 can be omitted, when the sum of the capacitor voltage Vca and the current source voltage Vcu2 is greater than the voltage Vref, the comparator 121 can be driven to output the second control signal CS2.

To sum up, the low-end device of the present invention can output a control signal to the high-end device without requiring a pressurized lift circuit when instructing the high-end device to perform work. On the other hand, the present invention has lower cost and market competitiveness compared with the conventional device using the pressurized lifting circuit.

The present invention has been described in detail above, but the above is only one of the preferred embodiments of the present invention, and should not limit the scope of the present invention, that is, all claims made according to the scope of the present invention are equal. Changes and modifications should still fall within the scope of the patent of the present invention.

100: High and low end drive system 10: High-end control module 11: Voltage regulator unit 111: Regulator 112: Capacitor 12: Current trigger 121: Comparator 121A: The first input terminal 121B: The second input terminal 122: first current source 123: Load Cell 20: Low-end control module 21: Buck module 22: constant current trigger 221: Switch Controller 222: Second current source 23: Low-end constant current source Vref: reference voltage source PS: Power supply device HI: High side voltage input side FG: floating ground Gnd: ground terminal CPU1: first controller CS1: The first control signal CPU2: Second Controller CS2: The second control signal C1: pulling current Vin1: reference voltage Vin2: node voltage Vin3: reference voltage Vin4: node voltage Vfg1: floating voltage level Vfg2: floating voltage level Vca: capacitor voltage Vcu1: Current source voltage Vcu2: Current source voltage

FIG. 1 is a block diagram of a high- and low-end driving system of the present invention.

FIG. 2 is a schematic circuit diagram of a high- and low-end driving system of the present invention.

FIG. 3 is a working schematic diagram (1) of the high- and low-end drive system of the present invention.

FIG. 4 is a working schematic diagram (2) of the high- and low-end drive system of the present invention.

100: High and low end drive system

10: High-end control module

112: Capacitor

20: Low-end control module

PS: Power supply device

CPU1: first controller

CPU2: Second Controller

HI: High side voltage input side

FG: floating ground

Gnd: ground terminal

Claims (5)

A high and low end drive system comprising: a high-end control module, comprising a voltage-stabilizing unit disposed on the input side of the high-side voltage, and a current trigger connected to the output of the voltage-stabilizing unit; and A low-end control module includes a step-down module connected to the current trigger, a constant-current trigger connected in series between the step-down module and the ground, and an input connected to the voltage regulator unit and The output is connected to the low-end constant current source of the ground terminal; Wherein, the reference voltage source of the current trigger and the input terminal of the low-end constant current source are connected to a floating ground together to make the reference voltage change with the floating ground, and the constant current trigger receives the first control signal When generating a pulling current through the current trigger to change the comparison voltage, the current trigger outputs a second control signal when detecting that the comparison voltage is changed relative to the reference voltage. The high- and low-side driving system of claim 1, wherein the voltage regulator unit comprises a voltage regulator connected to the input side of the high-side voltage, and a capacitor connected to the output of the voltage regulator. The high-low-side driving system according to claim 2, wherein the voltage regulator is a linear voltage regulator or a switching voltage regulator. The high-low-side driving system of claim 1, wherein the current trigger comprises a comparator, a first current source whose input is connected to the capacitor and whose output is connected to the comparator, and a first current source connected in series with the first current a load unit between the source and the step-down module, the first input end of the comparator is connected between the output of the first current source and the input of the load unit, the second input end of the comparator is connected to the a reference voltage source, one end of the reference voltage source is connected to the floating ground for changing the reference voltage in coordination with the floating ground; The constant current trigger includes a switch controller that is turned on or off according to the first control signal, and a second current source connected in series to the switch controller, and the passing current of the second current source is greater than the first current The through current of the source, when the switch controller is turned on, changes the node voltage of the first input end of the comparator through the first current source and the second current source in series, and switches the output of the comparator to output by changing the node voltage the second control signal. The high-low-side driving system of claim 1, wherein the step-down module includes one or more transistor switches disposed between the current trigger and the constant current trigger.

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