CN216672600U - Voltage source parallel current-sharing control circuit - Google Patents
Voltage source parallel current-sharing control circuit Download PDFInfo
- Publication number
- CN216672600U CN216672600U CN202022590460.8U CN202022590460U CN216672600U CN 216672600 U CN216672600 U CN 216672600U CN 202022590460 U CN202022590460 U CN 202022590460U CN 216672600 U CN216672600 U CN 216672600U
- Authority
- CN
- China
- Prior art keywords
- current
- output
- sharing control
- control circuit
- resistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model discloses a voltage source parallel current-sharing control circuit, which comprises at least two voltage sources and at least two current-sharing control circuits. The output ends of the two voltage sources are respectively connected in parallel after passing through a current-sharing control circuit. The current-sharing control circuit is connected in series with the output negative terminal or the output positive terminal of the voltage source or connected in parallel between the output negative terminal and the output positive terminal of the voltage source. The power switch in the current-sharing control circuit is used as an actuating mechanism of the whole current-sharing control circuit, different conduction states are realized according to a control signal output by a comparison driving circuit in the current-sharing control circuit, the function of adjusting dynamic current sharing between power supplies is realized when the load current is larger than the carrying capacity of a certain power supply, and meanwhile, the reliable work of any parallel power supplies is ensured. The utility model adopts an external discrete device to design a current-sharing control circuit, realizes a control mode of simulating droop characteristics, saves a current-sharing bus in the traditional parallel current-sharing control of a power module, and realizes the parallel current-sharing control among voltage sources by using a simple circuit.
Description
Technical Field
The utility model relates to the field of power supply capacity expansion, in particular to a voltage source parallel current-sharing control circuit.
Background
In the field of power supply application, a power supply is generally required to have parallel capacity expansion capability, so that the development work of high-power supply capability equipment can be realized more quickly. Particularly, some CPC (PC I, chinese means peripheral component interconnection, CPCI is compact PCI), VPX board cards (high-speed serial board cards) devices, and a power supply module is selected in the board cards to perform secondary development and design. However, some power modules often do not support hard parallel connection or require externally provided parallel current sharing bus connections. Currently, few power modules are capable of implementing a thermally parallel design using droop characteristic control. Therefore, the difficulty in selecting the power module is high, or the requirement on an external connecting line is high, the parallel current sharing design of the power module is not facilitated, the board card adopting the power module can not support parallel current sharing, and the use requirement of a client can not be met.
SUMMERY OF THE UTILITY MODEL
The utility model aims to disclose a voltage source parallel current-sharing control circuit, which realizes parallel current sharing among power modules or among board cards.
The purpose of the utility model is realized by the following technical scheme:
the voltage source parallel current-sharing control circuit comprises at least two voltage sources and at least two current-sharing control circuits, wherein the output ends of the two voltage sources are connected in parallel after passing through one current-sharing control circuit respectively; the current-sharing control circuit is connected in series with the output negative end of the voltage source, and the voltage between the output positive end of the voltage source and the output end of the current-sharing control circuit is used as the power supply voltage of a load; or the current-sharing control circuit is connected in series with the output positive end of the voltage source, and the voltage between the output negative end of the voltage source and the output end of the current-sharing control circuit is used as the power supply voltage of the load; or the current-sharing control circuit is connected in parallel between the output negative end and the output positive end of the voltage source, and the voltage between the output positive end and the output negative end of the current-sharing control circuit is used as the power supply voltage of the load.
Furthermore, the current-sharing control circuit comprises a current sampling circuit, a power switch, a current amplifying circuit and a comparison driving circuit; when the current-sharing control circuit is connected in series with the output negative terminal or the output positive terminal of the voltage source, one end of the current sampling circuit is used as the input end of the current-sharing control circuit to be connected with the output negative terminal or the output positive terminal of the voltage source, and the other end of the current sampling circuit is connected with one end of the power switch; the first input end and the second input end of the current amplifying circuit are respectively connected to two ends of the current sampling circuit; the output end of the current amplifying circuit is connected with the input end of the comparison driving circuit; the output end of the comparison driving circuit is connected with the control end of the power switch; and the other end of the power switch is used as the output end of the current-sharing control circuit.
Furthermore, the current-sharing control circuit comprises a current sampling circuit, a power switch, a current amplifying circuit and a comparison driving circuit; when the current-sharing control circuit is connected in parallel between the output negative terminal and the output positive terminal of the voltage source, one end of the current sampling circuit is used as a first input end of the current-sharing control circuit to be connected with the output negative terminal of the voltage source, and one end of the power switch is used as a second input end of the current-sharing control circuit to be connected with the output positive terminal of the voltage source; the other end of the current sampling circuit is used as the output negative terminal of the current-sharing control circuit; the first input end and the second input end of the current amplifying circuit are respectively connected to two ends of the current sampling circuit; the output end of the current amplifying circuit is connected with the input end of the comparison driving circuit; the output end of the comparison driving circuit is connected with the control end of the power switch; and the other end of the power switch is used as the output positive end of the current-sharing control circuit.
Further, the current amplifying circuit comprises a second resistor, a third resistor, a fourth resistor and a first operational amplifier; one end of the second resistor is used as a first input end of the current amplifying circuit, and one end of the third resistor is used as a second input end of the current amplifying circuit; the other end of the second resistor is connected with the inverting input end of the first operational amplifier, and the other end of the third resistor is connected with the non-inverting input end of the first operational amplifier; and the output end of the first operational amplifier is used as the output end of the current amplification circuit.
Further, the comparison driving circuit comprises a second operational amplifier, a fifth resistor and a sixth resistor; the inverting input end of the second operational amplifier is used as the input end of the comparison driving circuit and is connected with the output end of the current amplifying circuit; one end of the fifth resistor is used for inputting a reference voltage, and the other end of the fifth resistor is connected with one end of the sixth resistor and the non-inverting input end of the second operational amplifier; the other end of the sixth resistor is grounded; the output end of the second operational amplifier is used as the output end of the comparison driving circuit and is connected with the control end of the power switch.
Further, the comparison driving circuit comprises a second operational amplifier, a fifth resistor, a sixth resistor, a seventh resistor and an eighth resistor; the non-inverting input end of the second operational amplifier is used as the input end of the comparison driving circuit and is connected with the output end of the current amplifying circuit; one end of the fifth resistor is used for inputting a reference voltage, and the other end of the fifth resistor is connected with one end of the sixth resistor and the inverting input end of the second operational amplifier; the other end of the sixth resistor is grounded; the output end of the second operational amplifier is used as the output end of the comparison driving circuit and is connected with the control end of the power switch; one end of the seventh resistor is connected with the positive output end of the voltage source, and one end of the eighth resistor is connected with the negative output end of the voltage source; the other end of the seventh resistor and the other end of the eighth resistor are connected with the output end of the second operational amplifier.
Furthermore, the power switch is an NMOS tube; the source electrode of the NMOS tube is used as one end of the power switch, the drain electrode of the NMOS tube is used as the other end of the power switch, and the grid electrode of the NMOS tube is used as the control end of the power switch.
Furthermore, the power switch is a PMOS tube; the source electrode of the PMOS tube is used as one end of the power switch, the drain electrode of the PMOS tube is used as the other end of the power switch, and the grid electrode of the PMOS tube is used as the control end of the power switch.
Further, when the power required by the load is not more than the maximum output power of the voltage source, the power switch is completely conducted; otherwise, the power switch is conducted in a resistive mode.
The utility model mainly adopts an external discrete device to design a current-sharing control circuit, realizes a control mode of simulating droop characteristics, saves a current-sharing bus in the traditional parallel current-sharing control of the power supply module, and realizes the parallel current-sharing control among voltage sources by using a simple circuit. The power switch in the current-sharing control circuit is used as an actuating mechanism of the whole current-sharing control circuit, different conduction states are realized according to the control signal output by the comparison driving circuit in the current-sharing control circuit, the function of adjusting dynamic current sharing among power supplies is realized when the load current is larger than the carrying capacity of a certain power supply, and meanwhile, the reliable work of any parallel power supplies is ensured.
Drawings
FIG. 1 is a block diagram of a current sharing control circuit of the present invention connected in series to the negative output terminal of a voltage source;
FIG. 2 is a block diagram of the current sharing control circuit of the present invention connected in series to the positive output terminal of the voltage source;
FIG. 3 is a block diagram of the current sharing control circuit of the present invention connected in parallel between the positive output terminal and the negative output terminal of the voltage source;
FIG. 4 is a block diagram of the current sharing control circuit connected in series to the negative output terminal of the voltage source according to the present invention;
FIG. 5 is a schematic circuit diagram of the current sharing control circuit of the present invention connected in series to the negative output terminal of the voltage source;
FIG. 6 is a block diagram of the current sharing control circuit connected in parallel between the positive output terminal and the negative output terminal of the voltage source according to the present invention;
FIG. 7 is a schematic circuit diagram of the current sharing control circuit connected in parallel between the positive output terminal and the negative output terminal of the voltage source according to the present invention.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without inventive step, are intended to be within the scope of the present disclosure.
The voltage source parallel current-sharing control circuit comprises at least two voltage sources and at least two current-sharing control circuits, wherein the output ends of the two voltage sources are connected in parallel after passing through one current-sharing control circuit respectively. The current-sharing control circuit is connected in series with the output negative terminal or the output positive terminal of the voltage source, or the current-sharing control circuit is connected in parallel between the output negative terminal and the output positive terminal of the voltage source, as shown in fig. 1 to 3. Fig. 1 is a block diagram of a current-sharing control circuit connected in series to the output negative terminal of a voltage source, where the voltage between the output positive terminal of the voltage source and the output terminal of the current-sharing control circuit is used as the supply voltage VOUT of a load. Fig. 2 shows that the current-sharing control circuit is connected in series to the positive output terminal of the voltage source, and the voltage between the negative output terminal of the voltage source and the output terminal of the current-sharing control circuit is used as the supply voltage VOUT of the load. Fig. 3 shows that the current-sharing control circuit is connected in parallel between the output negative terminal and the output positive terminal of the voltage source, and the voltage between the output positive terminal and the output negative terminal of the current-sharing control circuit is used as the supply voltage VOUT of the load.
Further, when the current-sharing control circuit is connected in series with the output negative terminal or the output positive terminal of the voltage source, the current-sharing control circuit has an input terminal and an output terminal. The current-sharing control circuit comprises a current sampling circuit, a power switch, a current amplifying circuit and a comparison driving circuit. The current amplification circuit has a first input terminal, a second input terminal, and an output terminal. The comparison driving circuit has an input terminal and an output terminal. One end of the current sampling circuit is used as the input end of the current-sharing control circuit to be connected with the output negative end or the output positive end of the voltage source, and the other end of the current sampling circuit is connected with one end of the power switch. The first input end and the second input end of the current amplifying circuit are respectively connected to two ends of the current sampling circuit. The output end of the current amplifying circuit is connected with the input end of the comparison driving circuit. The output end of the comparison driving circuit is connected with the control end of the power switch. The other end of the power switch is used as the output end of the current-sharing control circuit.
The current sampling circuit converts the output current of the output negative terminal or the output positive terminal of the voltage source into a voltage signal and transmits the voltage signal to the current amplifying circuit. The current amplifying circuit amplifies the voltage signal according to a certain proportion and then transmits the amplified voltage signal to the comparison driving circuit. The comparison driving circuit compares the amplified voltage signal with a voltage reference and outputs a control signal to a control end of the power switch. The power switch is used as an actuating mechanism of the whole current-sharing control circuit, different conduction states are realized according to control signals output by the comparison driving circuit, so that the magnitude of the output current of the voltage source is controlled, the function of adjusting dynamic current sharing between the power sources is realized when the load current is larger than the carrying capacity of a certain power source, and the purpose of outputting current sharing by the voltage source is realized.
FIG. 5 is a schematic diagram of a current sharing control circuit connected in series to the negative output terminal of a voltage source. The working principle of the current-sharing control circuit connected in series with the positive output end of the voltage source is the same as that of the current-sharing control circuit connected in series with the negative output end of the voltage source. The block diagrams are similar, so a description is given in the alternative.
The current sampling circuit of the utility model can be any current sampling circuit as long as the current sampling function can be realized. For convenience of description, the current sampling circuit of the present embodiment adopts a resistance sampling manner.
The current sampling circuit in this embodiment includes a resistor R1. One end of the resistor R1 is connected with the output negative terminal of the voltage source, and the other end of the resistor R1 is connected with one end of the power switch. The resistor R1 converts the output current of the negative terminal of the voltage source into a voltage signal, i.e., the voltage across the resistor R1. Two ends of the resistor R1 are connected to two input ends of the current amplifying circuit.
The current amplifying circuit comprises a resistor R2, a resistor R3, a resistor R4 and an operational amplifier U9A. One end of the resistor R2 is connected to one end of the resistor R1 as a first input terminal of the current amplification circuit, and one end of the resistor R3 is connected to the other end of the resistor R1 as a second input terminal of the current amplification circuit. The other end of the resistor R2 is connected to the inverting input terminal of the operational amplifier U9A, and the other end of the resistor R3 is connected to the non-inverting input terminal of the operational amplifier U9A. The output terminal of the operational amplifier U9A serves as the output terminal of the current amplifying circuit. The resistor R4 is connected between the output terminal and the inverting input terminal of the operational amplifier U9A. VSS is the supply voltage of U9A.
The comparison driving circuit comprises an operational amplifier U9B, a resistor R5 and a resistor R6. The inverting input terminal of the operational amplifier U9B is connected to the output terminal of the current amplifying circuit as the input terminal of the comparison driving circuit. One end of the resistor R5 receives the reference voltage Vref, and the other end of the resistor R5 is connected to one end of the resistor R6 and the non-inverting input terminal of the operational amplifier U9B. The other end of the resistor R6 is connected to ground GND. The output end of the operational amplifier U9B is used as the output end of the comparison driving circuit to be connected with the control end of the power switch. VSS is the supply voltage of U9B.
The power switch comprises an NMOS transistor V1. The source of the NMOS transistor V1 is used as one end of the power switch, the drain of the NMOS transistor V1 is used as the other end of the power switch, and the gate of the NMOS transistor V1 is used as the control end of the power switch. The power switch of the present invention can also be implemented by other devices or circuits with power switch function in the prior art, and the replacement of the implementation manner of the power switch without creative work falls within the protection scope of the present invention.
The operating principle of the circuit shown in fig. 5 is: when the output power of the voltage source is set to be P and the output voltage is set to be U0, the output current of the voltage source is set to be P/U0.
When the output current I flows through the resistor R1, a voltage drop is generated, that is, the output current is converted into a voltage signal, and the voltage across the resistor R1 is the converted voltage. The converted voltage was denoted as U1, and then U1 ═ I × R1. The amplification factor of the current amplifier circuit is denoted by K, and as is known from the operating principle of the operational amplifier, K is R4/R2. If the output voltage of the current amplifying circuit is denoted as U2, U2 is K × U1, and U2 is also the voltage of the inverting input terminal of the operational amplifier U9B. When the voltage at the non-inverting input terminal of the comparison driving circuit is denoted as U3, U3 is Vref × R6/(R5+ R6), where Vref is the reference voltage. When the output power P is not more than the maximum output power Pmax of the voltage source, the output current I is not more than the maximum output current Imax, a reasonable reference voltage value is set, so that U2 is less than U3, the output of the operational amplifier U9B is at a high level, and the power switch is completely switched on. When the output power (power required by the load) P is greater than the maximum output power Pmax of the voltage source, the output current I is greater than the maximum output current Imax, and at this time, U2> U3, the output of the operational amplifier U9B is at a low level, and the power switch is in resistive conduction. In the adjusting process, the high-gain amplification section of the operational amplifier U9B is utilized, so that the comparison driving circuit outputs a control signal to control the conduction of the power switch to be adjusted between complete conduction and resistive conduction. The conducting state of the power switch determines the magnitude of the current output by the voltage source, so that the aim of controlling the current output by the voltage source is fulfilled.
Taking the example of parallel connection of two voltage sources in fig. 1, the maximum output power of both voltage source 1 and voltage source 2 is set to Pmax. If the required power of the load is less than Pmax, the power switch is fully turned on, and the current-sharing control circuit is not in use at this time, and the requirement of the output power can be met no matter whether the output power is shared by the voltage source 1 and the voltage source 2 or one of the two. Assuming that the required power of the load is greater than Pmax and the required power of the load is borne by the voltage source 1 alone, and assuming that the power is still provided by the voltage source 1, the comparison driving circuit of the current sharing control circuit of the voltage source 1 detects that U2> U3, and at this time, the current sharing control circuit of the voltage source 1 enters a regulation mode, and the regulation power switch is switched from full conduction to resistive conduction. At this time, the series internal resistance of the current sharing control circuit of the voltage source 1 becomes large, and the output voltage U0 of the voltage source 1 does not change, and the supply voltage VOUT of the load tends to decrease at this time. When VOUT decreases to the value of the voltage output from voltage source 2, voltage source 2 starts to output power, and the supply voltage VOUT of the load stabilizes at the voltage level of voltage source 2, so that voltage source 1 and voltage source 2 share the power demand.
Therefore, the parallel voltage sources of the utility model are in a dynamic adjustment state, and if the required power of the load end is greater than the maximum output power of any one path of voltage source, the current sharing circuit corresponding to the path enters an adjustment mode. Similarly, as long as the reference voltage value Vref of the current-sharing control circuit is set properly, the circuit is suitable for parallel connection between any power supplies with the same voltage output.
FIG. 6 is a block diagram of a current sharing control circuit connected in parallel between the positive output terminal and the negative output terminal of a voltage source. When the current-sharing control circuit is connected in parallel between the output negative terminal and the output positive terminal of the voltage source, the current-sharing control circuit is provided with a first input terminal, a second input terminal, an output positive terminal and an output negative terminal. The current-sharing control circuit comprises a current sampling circuit, a current amplifying circuit, a comparison driving circuit and a power switch. The current amplification circuit has a first input terminal, a second input terminal, and an output terminal. The comparison driving circuit is provided with a first input end, a second input end and an output end. One end of the current sampling circuit is used as the first input end of the current-sharing control circuit to be connected with the output negative end of the voltage source, and one end of the power switch is used as the second input end of the current-sharing control circuit to be connected with the output positive end of the voltage source. The other end of the current sampling circuit is used as the output negative terminal of the current-sharing control circuit. The first input end and the second input end of the current amplifying circuit are respectively connected to two ends of the current sampling circuit. The output end of the current amplifying circuit is connected with the input end of the comparison driving circuit. The output end of the comparison driving circuit is connected with the control end of the power switch. The other end of the power switch is used as the output positive end of the current-sharing control circuit. And voltages at two ends of an output positive terminal and an output negative terminal of the current-sharing control circuit are used as a power supply voltage VOUT of a load.
FIG. 7 is a schematic diagram of a current-sharing control circuit connected in parallel between the positive output terminal and the negative output terminal of a voltage source. The current sampling circuit is still illustrated by the resistor R1. One end of the R1 is used as one end of the current sampling circuit, and the other end of the R1 is used as the other end of the current sampling circuit.
The current amplifying circuit comprises a resistor R2, a resistor R3, a resistor R4 and an operational amplifier U9A. One end of the resistor R2 is connected to one end of the resistor R1 as a first input terminal of the current amplification circuit, and one end of the resistor R3 is connected to the other end of the resistor R1 as a second input terminal of the current amplification circuit. The other end of the resistor R2 is connected to the inverting input terminal of the operational amplifier U9A, and the other end of the resistor R3 is connected to the non-inverting input terminal of the operational amplifier U9A. The output terminal of the operational amplifier U9A serves as the output terminal of the current amplifying circuit. Resistor R4 is connected between the output and inverting input of operational amplifier U9A. VSS is the supply voltage of U9A.
The comparison driving circuit comprises an operational amplifier U9B, a resistor R5, a resistor R6, a resistor R01 and a resistor R02. The non-inverting input terminal of the operational amplifier U9B is connected to the output terminal of the current amplifying circuit as the input terminal of the comparison driving circuit. One end of the resistor R5 receives the reference voltage Vref, and the other end of the resistor R5 is connected to one end of the resistor R6 and the inverting input terminal of the operational amplifier U9B. The other end of the resistor R6 is connected to ground GND. The output end of the operational amplifier U9B is used as the output end of the comparison driving circuit and is connected with the control end of the power switch. One end of the resistor R01 is connected with the positive output terminal of the voltage source, and one end of the resistor R02 is connected with the negative output terminal of the voltage source. The other end of the resistor R01 and the other end of the resistor R02 are connected with the output end of the operational amplifier U9B. VSS is the supply voltage of U9B.
The power switch comprises a PMOS tube V2. The source of the PMOS transistor V2 is used as one end of the power switch, the drain of the PMOS transistor V2 is used as the other end of the power switch, and the gate of the PMOS transistor V2 is used as the control end of the power switch. The power switch of the present invention can also be implemented by other devices or circuits with power switch function in the prior art, and the replacement of the implementation manner of the power switch without creative work falls within the protection scope of the present invention.
The working principle of the current-sharing control circuit connected in parallel between the output positive terminal and the output negative terminal of the voltage source is the same as that of the current-sharing control circuit connected in series between the output positive terminal or the output negative terminal of the voltage source, and is not described herein again. When the current-sharing control circuit is connected in parallel between the output positive end and the output negative end of the voltage source, when the output current is smaller than a set value, the output DR of the driving comparison circuit is at a low level, and at the moment, the V2 driving voltage is conducted at a negative voltage; when the output current is larger than the set value, the output DR increases with the high gain section of the operational amplifier, and V2 tends to the series resistance. Thus, a dynamic adjustment mode is entered. The resistor R01 is used for providing a driving and discharging path for the driving end of the field effect transistor and ensuring the normal switching of the voltage type field effect transistor; the R02 has the function of providing a robust design, if the high resistance of the driving signal is abnormal, the field effect transistor can be normally switched on due to the voltage division effect of the R02, so that the normal work is ensured, and otherwise, the field effect transistor is automatically switched off.
The connection in the present invention means an electrical connection, which may be a direct electrical connection or an indirect electrical connection through a device.
The above description is for the purpose of illustrating embodiments of the utility model and is not intended to limit the utility model, and it will be apparent to those skilled in the art that any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the utility model shall fall within the protection scope of the utility model.
Claims (8)
1. The voltage source is connected with the current-sharing control circuit in parallel, and the current-sharing control circuit is characterized by comprising at least two voltage sources and at least two current-sharing control circuits; the output ends of the two voltage sources are respectively connected in parallel after passing through a current-sharing control circuit; the current-sharing control circuit is connected in series with the output negative end of the voltage source, and the voltage between the output positive end of the voltage source and the output end of the current-sharing control circuit is used as the power supply voltage of a load; or the current-sharing control circuit is connected in series with the output positive end of the voltage source, and the voltage between the output negative end of the voltage source and the output end of the current-sharing control circuit is used as the power supply voltage of the load; or the current-sharing control circuit is connected in parallel between the output negative terminal and the output positive terminal of the voltage source, and the voltage between the output positive terminal and the output negative terminal of the current-sharing control circuit is used as the power supply voltage of the load;
the current-sharing control circuit comprises a current sampling circuit, a power switch, a current amplifying circuit and a comparison driving circuit; when the current-sharing control circuit is connected in series with the output negative terminal or the output positive terminal of the voltage source, one end of the current sampling circuit is used as the input end of the current-sharing control circuit to be connected with the output negative terminal or the output positive terminal of the voltage source, and the other end of the current sampling circuit is connected with one end of the power switch; the first input end and the second input end of the current amplifying circuit are respectively connected to two ends of the current sampling circuit; the output end of the current amplifying circuit is connected with the input end of the comparison driving circuit; the output end of the comparison driving circuit is connected with the control end of the power switch; and the other end of the power switch is used as the output end of the current-sharing control circuit.
2. The parallel current-sharing control circuit of the voltage source according to claim 1, wherein the current-sharing control circuit comprises a current sampling circuit, a power switch, a current amplifying circuit and a comparison driving circuit; when the current-sharing control circuit is connected in parallel between the output negative terminal and the output positive terminal of the voltage source, one end of the current sampling circuit is used as a first input end of the current-sharing control circuit to be connected with the output negative terminal of the voltage source, and one end of the power switch is used as a second input end of the current-sharing control circuit to be connected with the output positive terminal of the voltage source; the other end of the current sampling circuit is used as the output negative end of the current-sharing control circuit; the first input end and the second input end of the current amplifying circuit are respectively connected to two ends of the current sampling circuit; the output end of the current amplifying circuit is connected with the input end of the comparison driving circuit; the output end of the comparison driving circuit is connected with the control end of the power switch; and the other end of the power switch is used as the output positive end of the current-sharing control circuit.
3. The parallel current sharing control circuit of voltage sources according to claim 1 or 2, wherein when the power required by the load is not greater than the maximum output power of the voltage sources, the power switch is fully turned on; otherwise, the power switch is conducted in a resistive mode.
4. The parallel current sharing control circuit for voltage sources according to claim 1 or 2, wherein the current amplifying circuit comprises a second resistor, a third resistor, a fourth resistor and a first operational amplifier; one end of the second resistor is used as a first input end of the current amplifying circuit, and one end of the third resistor is used as a second input end of the current amplifying circuit; the other end of the second resistor is connected with the inverting input end of the first operational amplifier, and the other end of the third resistor is connected with the non-inverting input end of the first operational amplifier; and the output end of the first operational amplifier is used as the output end of the current amplification circuit.
5. The parallel current sharing control circuit of voltage source according to claim 1, wherein the comparison driving circuit comprises a second operational amplifier, a fifth resistor and a sixth resistor; the inverting input end of the second operational amplifier is used as the input end of the comparison driving circuit and is connected with the output end of the current amplifying circuit; one end of the fifth resistor is used for inputting a reference voltage, and the other end of the fifth resistor is connected with one end of the sixth resistor and the non-inverting input end of the second operational amplifier; the other end of the sixth resistor is grounded; the output end of the second operational amplifier is used as the output end of the comparison driving circuit and is connected with the control end of the power switch.
6. The parallel current sharing control circuit of voltage source according to claim 2, wherein the comparison driving circuit comprises a second operational amplifier, a fifth resistor, a sixth resistor, a seventh resistor and an eighth resistor; the non-inverting input end of the second operational amplifier is used as the input end of the comparison driving circuit and is connected with the output end of the current amplifying circuit; one end of the fifth resistor is used for inputting a reference voltage, and the other end of the fifth resistor is connected with one end of the sixth resistor and the inverting input end of the second operational amplifier; the other end of the sixth resistor is grounded; the output end of the second operational amplifier is used as the output end of the comparison driving circuit and is connected with the control end of the power switch; one end of the seventh resistor is connected with the positive output end of the voltage source, and one end of the eighth resistor is connected with the negative output end of the voltage source; the other end of the seventh resistor and the other end of the eighth resistor are connected with the output end of the second operational amplifier.
7. The voltage source parallel current sharing control circuit of claim 1, wherein the power switch is an NMOS transistor; the source electrode of the NMOS tube is used as one end of the power switch, the drain electrode of the NMOS tube is used as the other end of the power switch, and the grid electrode of the NMOS tube is used as the control end of the power switch.
8. The parallel current sharing control circuit for voltage sources of claim 2, wherein the power switch is a PMOS transistor; the source electrode of the PMOS tube is used as one end of the power switch, the drain electrode of the PMOS tube is used as the other end of the power switch, and the grid electrode of the PMOS tube is used as the control end of the power switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022590460.8U CN216672600U (en) | 2020-11-11 | 2020-11-11 | Voltage source parallel current-sharing control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022590460.8U CN216672600U (en) | 2020-11-11 | 2020-11-11 | Voltage source parallel current-sharing control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216672600U true CN216672600U (en) | 2022-06-03 |
Family
ID=81757650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022590460.8U Active CN216672600U (en) | 2020-11-11 | 2020-11-11 | Voltage source parallel current-sharing control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216672600U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116865559A (en) * | 2023-09-05 | 2023-10-10 | 长春吉大正元信息技术股份有限公司 | Dual-power-supply input power equalization circuit and method |
-
2020
- 2020-11-11 CN CN202022590460.8U patent/CN216672600U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116865559A (en) * | 2023-09-05 | 2023-10-10 | 长春吉大正元信息技术股份有限公司 | Dual-power-supply input power equalization circuit and method |
| CN116865559B (en) * | 2023-09-05 | 2023-12-15 | 长春吉大正元信息技术股份有限公司 | Dual-power-supply input power equalization circuit and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| USRE39374E1 (en) | Constant voltage power supply with normal and standby modes | |
| US7683592B2 (en) | Low dropout voltage regulator with switching output current boost circuit | |
| US10474174B2 (en) | Programmable supply generator | |
| US8436603B2 (en) | Voltage regulator operable to switch between a two-stage structure operation and a three-stage structure operation | |
| CN102117089B (en) | Low-voltage drop voltage stabilizer | |
| JP2009199501A (en) | Voltage regulator | |
| CN103135648A (en) | Low dropout regulator | |
| CN102279609B (en) | Voltage regulator and reference voltage generating circuit thereof | |
| CN106292824A (en) | low-dropout regulator circuit | |
| CN111930173B (en) | LDO circuit with low quiescent current and quick response and SOC system | |
| CN109450417B (en) | A start suppression circuit that overshoots for LDO | |
| CN112327987B (en) | Low dropout regulator and electronic equipment | |
| CN103166173A (en) | Overvoltage protection circuit | |
| CN109343644B (en) | Automatic adjust current-limiting protection circuit | |
| CN216672600U (en) | Voltage source parallel current-sharing control circuit | |
| CN103631299B (en) | A kind of constant pressure difference, variable output voltage low pressure difference linear voltage regulator | |
| CN110109501B (en) | Load jump quick response circuit and quick response method | |
| CN216356513U (en) | Off-line switching power supply circuit and feedback control chip thereof | |
| CN202632145U (en) | Low-dropout voltage regulator | |
| US8212617B2 (en) | Fast class AB output stage | |
| CN111446932B (en) | Control circuit based on operational amplifier | |
| JP2013207861A (en) | Charge and discharge circuit | |
| CN209948734U (en) | Automatic load detection circuit | |
| CN2906714Y (en) | Low pressure drop voltage regulator with common mode negative feedback | |
| CN103380383B (en) | For the resultant current sense resistor of wider current-sensing range |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |