Direct current voltage regulation circuit with high stable output

Abstract

The utility model provides a direct current voltage regulating circuit with high stable output, which comprises a power supply module for outputting direct current and a load module for receiving high-voltage direct current, and a voltage regulating unit is arranged between the load module and the power supply module; the voltage regulating unit comprises a voltage regulating sub-module and a plurality of standby sub-modules, the standby sub-modules are connected in parallel with the voltage regulating sub-module, a post-stage controller is arranged between the voltage regulating unit and the load module, and the post-stage controller is used for regulating the operating power of the voltage regulating sub-module and the standby sub-modules and the number of circuits merged into the standby sub-modules. The stability of the output voltage of the voltage regulating unit is improved. According to the utility model, the failure probability of the BOOST circuit can be reduced, and when the input DC voltage is reduced, the stability of the output DC voltage is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of direct current conversion, in particular to a direct current voltage regulating circuit with high stable output. Background Art

[0002] In recent years, renewable energy systems with DC low-voltage power supply, such as photovoltaic power generation and battery power supply, have been widely used. It is imperative to improve the power supply efficiency, power supply quality and power supply reliability of low-voltage new energy power supply systems.

[0003] A low-voltage DC power supply performs DC / DC conversion to a DC output. This solution solves the power supply problem for fixed equipment. When the output voltage of a boost DC power supply falls below the input voltage, the boost circuit fails, causing the input power to short-circuit the load. This makes short-circuit protection in high-current (high-power) systems very difficult to control. Utility Model Content

[0004] In view of this, the problem to be solved by the present invention is to provide a DC voltage regulating circuit with high stable output, which can reduce the failure probability of the BOOST circuit and ensure the stability of the output DC voltage when the input DC voltage decreases.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A DC voltage regulating circuit with high stable output includes a power module for outputting DC power and a load module for receiving high-voltage DC power, wherein a voltage regulating unit is provided between the load module and the power module;

[0007] The voltage regulating unit includes a voltage regulating submodule and several spare submodules. The spare submodules are connected in parallel with the voltage regulating submodule. A post-stage controller is provided between the voltage regulating unit and the load module. The post-stage controller is used to adjust the operating power of the voltage regulating submodule and the spare submodules, and the number of circuits incorporated into the spare submodules, so as to improve the stability of the output voltage of the voltage regulating unit.

[0008] Furthermore, the voltage regulation submodule includes a boost circuit, the boost circuit includes a CN13 interface connected to the load module, and the power supply module includes a VINPOU interface for outputting direct current;

[0009] An inductor L1 and a forward diode D3 are connected in series between the VINPOU interface and the CN13 interface, respectively. Several capacitors COUT are connected in series between the CN13 interface and the ground. The output end of the inductor L1 is connected to the source of the MOS transistor Q1. A resistor R51 is connected in series between the drain of the MOS transistor Q1 and the ground. The gate of the MOS transistor Q1 is connected to port 6 of the connector CN8 to control whether the MOS transistor Q1 is turned on.

[0010] Furthermore, the MOS transistor Q1 is connected in parallel with the MOS transistor Q2, and the source, gate and drain of the MOS transistor Q1 and the MOS transistor Q2 are connected in pairs.

[0011] Furthermore, a backup boost circuit is connected in series between the VINPOU interface and the capacitor COUT. The backup boost circuit includes an inductor L2, a MOS transistor Q3, a MOS transistor Q4 and a diode D11. The circuit connection structure of the inductor L2, the MOS transistor Q3, the MOS transistor Q4, and the diode D5 is exactly the same as the connection structure of the inductor L1, the MOS transistor Q1, the MOS transistor Q2 and the diode D3. The gate of the MOS transistor Q3 is connected to port 1 of CN8.

[0012] Furthermore, the voltage regulation submodule includes a control circuit for controlling the action of the boost circuit, and the control circuit includes a control chip U2, the GATB1 end of the control chip U2 is connected to port 2 of the connector SN8, the GATB2 end of the control chip U2 is connected to port 1 of the connector SN8, and the connector CN8 is plug-connected to the connector SN8.

[0013] Furthermore, the FB port of the control chip U2 is electrically connected to an input feedback circuit for adjusting the output voltage of the voltage regulating submodule;

[0014] The input feedback circuit includes an optocoupler EL, wherein ports 4 and 1 of the optocoupler EL are connected to a pull-up power supply VBIAS via pull-up resistors, a diode D1 is connected in series between port 4 of the optocoupler EL and the FB port, and a diode D2 is connected in series between port 2 of the optocoupler EL and the ground. Resistors R1, R2, and R3 are connected in series in sequence between the output end of the power module and the ground, and a control end of the diode D2 is connected between resistors R1 and R2.

[0015] Furthermore, the circuit structure of the standby submodule is identical to that of the voltage regulating submodule, and the output end of the diode D1 is connected to all standby submodules for synchronously controlling the synchronous operation of all standby submodules and the voltage regulating submodule.

[0016] The advantages and positive effects of the utility model are:

[0017] 1. By setting up a voltage regulating unit including a voltage regulating submodule and several spare submodules, when the power supply of the power module is insufficient, the post-stage controller can detect the decrease in the output voltage of the voltage regulating unit, control the connection between the spare submodule and the load module, and adjust the output power of the spare submodule and the voltage regulating submodule to improve the stability of the output voltage. At the same time, since the output ends of the voltage regulating submodule and the spare submodule are connected in parallel, the output power is accumulated, which can improve the stability of the output power and the conversion efficiency of the input voltage energy, balance the peak current of each power tube, and improve the overall stability and reliability of the circuit.

[0018] 2. By setting up a backup boost circuit in the voltage regulation submodule and the backup submodule, the anti-interference performance of the voltage regulation unit can be improved.

[0019] 3. By setting up an input feedback circuit, when the output voltage of the power module decreases, the output voltage of the voltage regulating submodule and the standby submodule can be adjusted synchronously to make the output voltage consistent, thereby reducing the failure probability of the BOOST circuit. At the same time, it is convenient for the subsequent controller to synchronously control the operating power of the voltage regulating submodule and the standby submodule and the number of access circuits of the standby submodule according to the output voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 This is an overall system diagram of a DC voltage regulating circuit with high stable output in the utility model;

[0022] Figure 2 This is a boost circuit diagram of a DC voltage regulating circuit with high stable output in the utility model;

[0023] Figure 3 This is a control circuit diagram of a DC voltage regulating circuit with high stable output in the utility model;

[0024] Figure 4 This is an input feedback circuit diagram of a DC voltage regulating circuit with high stable output in the utility model;

[0025] Figure 5 The utility model discloses a connection circuit diagram of an input feedback circuit and a voltage regulating unit in a DC voltage regulating circuit with high stable output. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended only to describe specific embodiments and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] The utility model provides a DC voltage regulating circuit with high stable output, such as Figure 1 As shown, it includes a power module that outputs direct current and a load module that receives high-voltage direct current. A voltage regulating unit is provided between the load module and the power module for converting low-voltage direct current into stable high-voltage direct current.

[0029] like Figure 2 As shown, the power module includes a VINPOU interface for outputting low-voltage direct current. The voltage regulation unit includes a voltage regulation submodule, which includes a boost circuit for increasing the voltage and a control circuit for controlling the operation of the boost circuit.

[0030] The boost circuit includes a CN13 interface connected to the load module. An inductor L1 and a forward diode D3 are connected in series between the VINPOU interface and the CN13 interface in sequence. The diode D3 is connected in parallel with a diode D4 in the same direction. Several capacitors COUT are connected in series between the CN13 interface and the ground. The capacitors COUT are used to store electrical energy and filter out clutter.

[0031] The output end of inductor L1 is connected to the source of MOS transistor Q1. Resistor R51 is connected in series between the drain of MOS transistor Q1 and the ground. The gate of MOS transistor Q1 is connected to port 6 of connector CN8. Port 6 of CN8 communicates data with the control circuit to control whether MOS transistor Q1 is turned on.

[0032] To improve the performance of the boost circuit, MOS transistor Q1 is connected in parallel to MOS transistor Q2, and the source, gate, and drain of the two MOS transistors are interconnected. The actions of MOS transistor Q1 and MOS transistor Q2 are synchronized. When one of the MOS transistors is damaged, the normal operation of the boost circuit is not affected.

[0033] The boost circuit's power supply process is as follows: MOS transistor Q1 is turned on, connecting the VINPOU interface to ground through inductor L1. Inductor L1 stores charge, while capacitor COUT provides high-voltage power to CN13. MOS transistor Q1 is turned off, connecting the VINPOU interface to CN13 through inductor L1. The voltages of the INPOU port and inductor L1 are added together, causing CN13 to provide high-voltage power. Capacitor COUT charges and filters out noise, allowing the boost circuit to continuously output high-voltage power.

[0034] To improve the stability of the boost circuit's output voltage, a backup boost circuit is connected in series between the VINPOU interface and capacitor COUT. The backup boost circuit includes inductor L2, MOS transistors Q3, MOS transistors Q4, diodes D5, and diodes D6. The circuit connection structure of inductor L2, MOS transistors Q3, MOS transistors Q4, diodes D5, and diodes D6 is exactly the same as that of inductor L1, MOS transistors Q1, MOS transistors Q2, diodes D3, and diodes D4. The gates of MOS transistors Q3 and MOS transistors Q4 are both connected to port 1 of connector CN8. Port 1 of connector CN8 communicates data with the control circuit and can control whether MOS transistors Q3 and Q4 are conductive.

[0035] During power supply, MOS transistors Q1 and Q3 conduct alternately, ensuring that the CN13 interface consistently outputs a cumulative high voltage, improving output voltage stability. Furthermore, as long as at least one MOS transistor in the boost circuit is functioning properly, high voltage can be output, improving boost circuit performance.

[0036] like Figure 3 As shown, the control circuit includes control chip U2, model LTC3862-2. This chip has two sets of interleaved signal outputs, which can achieve high-efficiency conversion of the boost circuit. Connector CN8 communicates with control chip U2 through connector SN8, and connector CN8 and connector SN8 are plug-in connected.

[0037] Resistor R8 is connected in series between GATB1 of control chip U2 and port 2 of connector SN8, and resistor R15 is connected in series between GATB2 of control chip U2 and port 1 of connector SN8. GATB1 and GATB2 output interleaved signals to control the alternating operation of MOS transistors Q1 and Q3.

[0038] like Figure 4 As shown, the control chip U2 includes an FB port, which is electrically connected to an input feedback circuit for monitoring the output voltage of the power module. When the voltage of the power module decreases, the interleaved signals of the GATB1 port and the GATB2 port are adjusted to reduce the output voltage of the boost circuit.

[0039] The input feedback circuit includes an optocoupler EL, a diode D1 connected in series between the FB port and the pull-up power supply VBIAS, the input end of the diode D1 is connected to the 4th port of the optocoupler, the 3rd port of the optocoupler EL is connected to the ground, a diode D2 is connected in series between the 2nd port of the optocoupler EL and the ground, and a resistor R6 is connected in series between the 1st port of the optocoupler EL and the pull-up power supply VBIAS.

[0040] Resistors R1, R2, and R3 are connected in series between the output terminal of the power module and the ground in sequence. Resistors R1 and R2 are connected in parallel with capacitor C1. Capacitor C1 is connected in series with resistor R5. The control terminal of diode D2 is connected between resistors R1 and R2. Capacitor C2 is connected in series between the control terminal of diode D2 and port 2 of optocoupler EL. Resistor R4 is connected in series between the control terminal of diode D2 and the pull-up power supply VBIAS.

[0041] The control process is as follows: when the output voltage of the power module is normal, the diode D6 and the optocoupler EL are both off, and the voltage regulating submodule outputs normal power; when the output voltage of the power module decreases, the diode D6 and the optocoupler EL are turned on, the FB port voltage of the voltage regulating submodule and the standby voltage regulating submodule is increased, and the output voltage is reduced.

[0042] like Figure 5 As shown, the voltage-regulating unit includes several backup submodules, each with a circuit structure identical to that of the voltage-regulating submodule. A post-stage controller is located between the load module and the voltage-regulating unit. When the load module's receiving voltage drops, the post-stage controller integrates the backup submodules into the circuit and adjusts the output power of the submodules within the circuit to maintain the output voltage of the voltage-regulating unit.

[0043] The FB ports of the control chip of the backup voltage module are connected to the output end of the input feedback circuit so that the subsequent controller can synchronously adjust the output voltages of the voltage regulating submodule and the backup submodule to quickly match the corresponding operating power.

[0044] One embodiment of the present application is: when a single voltage regulating sub-module is connected to the circuit, the voltage regulating sub-module converts 50V into 102V, and the operating power is 2kw; when the input feedback circuit monitors that the power supply voltage of the power module is reduced, the output voltage of the voltage regulating sub-module is made 50V, and the post-stage controller connects a spare sub-module to the circuit and reduces the operating power of the two voltage regulating sub-modules to 1kw, and the output voltage of the voltage regulating sub-module is restored to 100V.

[0045] Through the above method, when the power supply voltage of the voltage regulating sub-module is unstable, the conversion efficiency can be improved by adjusting the number and operating power of the connected voltage regulating sub-modules, balancing the peak current of each power tube (the tube that serves as the final output in the amplifier circuit is called a power tube), and improving the circuit stability and reliability.

[0046] The above embodiments of the present invention are described in detail. However, the above contents are only preferred embodiments of the present invention and should not be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of this patent.

Claims

1. A DC voltage regulating circuit with high stable output, characterized in that: It includes a power supply module for outputting direct current and a load module for receiving high-voltage direct current, wherein a voltage regulating unit is provided between the load module and the power supply module; The voltage regulating unit includes a voltage regulating submodule and several spare submodules. The spare submodules are connected in parallel with the voltage regulating submodule. A post-stage controller is provided between the voltage regulating unit and the load module. The post-stage controller is used to adjust the operating power of the voltage regulating submodule and the spare submodules, and the number of circuits incorporated into the spare submodules, so as to improve the stability of the output voltage of the voltage regulating unit.

2. A DC voltage regulating circuit with high stable output according to claim 1, characterized in that: The voltage regulation submodule includes a boost circuit, the boost circuit includes a CN13 interface connected to the load module, and the power supply module includes a VINPOU interface for outputting direct current; An inductor L1 and a forward diode D3 are connected in series between the VINPOU interface and the CN13 interface, respectively. Several capacitors COUT are connected in series between the CN13 interface and the ground. The output end of the inductor L1 is connected to the source of the MOS transistor Q1. A resistor R51 is connected in series between the drain of the MOS transistor Q1 and the ground. The gate of the MOS transistor Q1 is connected to port 6 of the connector CN8 to control whether the MOS transistor Q1 is turned on.

3. A DC voltage regulating circuit with high stable output according to claim 2, characterized in that: The MOS transistor Q1 is connected in parallel to the MOS transistor Q2 , and the source, gate and drain of the MOS transistor Q1 and the MOS transistor Q2 are connected in pairs.

4. A DC voltage regulating circuit with high stable output according to claim 3, characterized in that: A backup boost circuit is connected in series between the VINPOU interface and the capacitor COUT. The backup boost circuit includes an inductor L2, a MOS transistor Q3, a MOS transistor Q4, and a diode D11. The circuit connection structure of the inductor L2, the MOS transistor Q3, the MOS transistor Q4, and the diode D5 is exactly the same as the connection structure of the inductor L1, the MOS transistor Q1, the MOS transistor Q2, and the diode D3. The gate of the MOS transistor Q3 is connected to port 1 of CN8.

5. The DC voltage regulating circuit with high stable output according to claim 1, characterized in that: The voltage regulation submodule includes a control circuit for controlling the action of the boost circuit. The control circuit includes a control chip U2. The GATB1 end of the control chip U2 is connected to port 2 of the connector SN8. The GATB2 end of the control chip U2 is connected to port 1 of the connector SN8. The connector CN8 is plugged into the connector SN8 to alternately control the conduction of the MOS tube Q1 and the MOS tube Q3.

6. A DC voltage regulating circuit with high stable output according to claim 5, characterized in that: The FB port of the control chip U2 is electrically connected to an input feedback circuit for adjusting the output voltage of the voltage regulation submodule; The input feedback circuit includes an optocoupler EL, wherein ports 4 and 1 of the optocoupler EL are connected to a pull-up power supply VBIAS via pull-up resistors, a diode D1 is connected in series between port 4 of the optocoupler EL and the FB port, and a diode D2 is connected in series between port 2 of the optocoupler EL and the ground. Resistors R1, R2, and R3 are connected in series in sequence between the output end of the power module and the ground, and a control end of the diode D2 is connected between resistors R1 and R2.

7. A DC voltage regulating circuit with high stable output according to claim 6, characterized in that: The circuit structure of the standby submodule is identical to that of the voltage regulating submodule. The output end of the diode D1 is connected to all the standby submodules for synchronously controlling the synchronous operation of all the standby submodules and the voltage regulating submodule.

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