Automobile output power supply compatible circuit

Abstract

The utility model relates to the technical field of automobile power supplies, in particular to an automobile output power supply compatible circuit. The circuit comprises a half-bridge LLC, a high-voltage input power supply, a first output branch, a second output branch and a secondary full-bridge rectification module or a secondary half-wave rectification module, the high-voltage input power supply is connected to the input end of the half-bridge LLC, the first output branch is connected to a secondary winding S1 of the half-bridge LLC, and the second output branch is connected to a secondary winding S2 of the half-bridge LLC; the secondary full-bridge rectification module is connected to the first output branch, and one end of the secondary full-bridge rectification module is connected with the second output branch; or the secondary side half-wave rectification module is connected to the first output branch. The output voltage in one power supply module is compatible with 24V and 12V of automobile electronic low-voltage power supplies, and the same module is used by only changing the position of an interface, so that the design and maintenance of an automobile low-voltage power supply system are greatly facilitated.

Description

Technical Field

[0001] This utility model relates to the field of automotive power supply technology, and in particular to an automotive output power supply compatible circuit. Background Technology

[0002] In automotive electronics, different countries and regions use different low-voltage power supplies, such as 24V and 12V, which leads to different charging equipment. Automotive low-voltage charging equipment is usually divided into 24V charging equipment and 12V charging equipment. If a unified set of equipment could be used, the development and maintenance costs of charging equipment would be reduced.

[0003] Given the current distinction between 24V and 12V low-voltage power supplies in automotive electronics, two approaches exist to ensure compatibility: One approach is to divide the charging equipment into two sets of modules: one for 24V and one for 12V, integrated into a single device with two interfaces. The interface selected depends on the voltage level of the device being charged. However, this method results in one module becoming unusable if it's incompatible with the device's voltage, leading to a waste of that module's capacity. Another approach is to design a single charging module with a very wide output voltage range to meet the requirements of both 24V and 12V charging devices. This approach, due to the wide output voltage range, requires calculating power devices and electromagnetic components based on higher current and voltage, resulting in wasted power and electromagnetic components within the module. Utility Model Content

[0004] This utility model provides an automotive output power supply compatibility circuit, which aims to solve the technical problems existing in the compatibility of low-voltage power supply in automotive electronics.

[0005] This utility model provides an automotive output power compatible circuit, including a half-bridge LLC, a high-voltage input power supply, a first output branch, a second output branch, and a secondary-side full-bridge rectifier module or a secondary-side half-wave rectifier module. The high-voltage input power supply is connected to the input terminal of the half-bridge LLC. The first output branch is connected to the secondary winding S1 of the half-bridge LLC, and the second output branch is connected to the secondary winding S2 of the half-bridge LLC. The secondary-side full-bridge rectifier module is connected to the first output branch, and one end of the secondary-side full-bridge rectifier module is connected to the second output branch; or the secondary-side half-wave rectifier module is connected to the first output branch.

[0006] As a further improvement of this utility model, when the first output branch is connected to the secondary full-bridge rectifier module, the first output branch includes diode D3, capacitor C2, and resistor R2. The secondary full-bridge rectifier module includes diodes D5, D6, and D7. The anode of diode D3 is connected to the same-name terminal of the secondary winding S1 and the cathode of diode D5. The cathode of diode D3 is connected to the cathode of diode D6, one end of capacitor C2, and one end of resistor R2. The anode of diode D5 is connected to the anode of diode D7, the other end of capacitor C2, the other end of resistor R2, and is connected to the second output branch. The anode of diode D6 is connected to the cathode of diode D7 and is connected to the second output branch. The output terminal Vout1 of the first output branch is located between capacitor C2 and resistor R2.

[0007] As a further improvement of this utility model, the second output branch includes a diode D4, a capacitor C4, and a resistor R1. The same-name terminals of the secondary winding S2 are respectively connected to one end of the capacitor C4 and one end of the resistor R1. The opposite-name terminals of the secondary winding S2 are respectively connected to the negative terminal of the diode D4 and the positive terminal of the diode D6. The positive terminal of the diode D4 is respectively connected to the other end of the capacitor C4, the other end of the resistor R1, and the positive terminal of the diode D5. The output terminal Vout2 of the second output branch is located between the capacitor C4 and the resistor R1.

[0008] As a further improvement of this utility model, when the first output branch is connected to the secondary half-wave rectifier module, the first output branch includes a diode D3, a capacitor C2, and a resistor R2. The secondary half-wave rectifier module includes a diode D5. The same-name terminals of the secondary winding S1 are respectively connected to the negative terminal of diode D3 and the positive terminal of diode D5. The negative terminal of diode D5 is respectively connected to one end of capacitor C2 and one end of resistor R2. The positive terminal of diode D3 is connected to the second output branch. The other end of capacitor C2 and the other end of resistor R2 are respectively connected to the second output branch. The output terminal Vout1 of the first output branch is located between capacitor C2 and resistor R2.

[0009] As a further improvement of this utility model, the second output branch includes a diode D4, a capacitor C4, and a resistor R1. The same-named terminals of the secondary winding S2 are respectively connected to the other end of the capacitor C2, the other end of the resistor R2, one end of the capacitor C4, and one end of the resistor R1. The opposite-named terminals of the secondary winding S2 are connected to the negative terminal of the diode D4. The positive terminal of the diode D4 is respectively connected to the positive terminal of the diode D3, the other end of the capacitor C4, the other end of the resistor R1, and ground. The output terminal Vout2 of the second output branch is located between the capacitor C4 and the resistor R1.

[0010] As a further improvement of this utility model, the number of windings in the secondary winding S1 is equal to the number of windings in the secondary winding S2.

[0011] As a further improvement of this utility model, the input terminal of the half-bridge LLC includes a primary winding P1 and a primary modulation module. The primary modulation module includes MOSFETs Q1 and Q2, diodes D1 and D2, polarized capacitors C3 and C1, inductors L1 and L2. The source of MOSFET Q1 is connected to the gate of MOSFET Q1, the drain of MOSFET Q2, and one end of inductor L1, respectively. The drain of MOSFET Q1 is connected to the positive terminal and the diode of the high-voltage input power supply, respectively. The negative terminal of transistor D1 and the positive terminal of polarized capacitor C3 are connected to the gate of transistor Q2, the negative terminal of the high-voltage input power supply, the positive terminal of diode D2, the negative terminal of polarized capacitor C1, and ground. The negative terminal of diode D2 is connected to the positive terminal of polarized capacitor C1, the positive terminal of diode D1, the negative terminal of polarized capacitor C3, one end of inductor L2, and the opposite-named terminal of primary winding P1. The other end of inductor L1 is connected to the other end of inductor L2 and the same-named terminal of primary winding P1.

[0012] The beneficial effects of this utility model are: by having an output voltage compatible with both 24V and 12V automotive electronic low-voltage power supplies in a single power module, the same module can be used in different regions and automotive low-voltage applications by simply changing the interface position, which greatly simplifies the design and maintenance of automotive low-voltage power supply systems. Attached Figure Description

[0013] Figure 1 This is a common automotive isolated DC circuit diagram;

[0014] Figure 2 This utility model includes a circuit diagram for automotive output power supply compatibility with an added secondary-side full-bridge rectifier module.

[0015] Figure 3 This utility model includes a circuit diagram for automotive output power supply compatibility with an added secondary half-wave rectifier module. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 It is a relatively common automotive isolated DC circuit. The topology used is a half-bridge LLC. The output is full-wave rectified, the input is 800V high voltage, and the output VOUT1 is a separate 24V or a separate 12V low voltage to charge the low voltage power supply device R1 or the lithium battery.

[0018] exist Figure 1 Based on the automotive isolated DC circuit, this invention improves upon it to achieve compatibility with automotive electronic low-voltage power supplies of 24V and 12V. Specifically, this invention provides an automotive output power supply compatibility circuit, including a half-bridge LLC, a high-voltage input power supply, a first output branch, a second output branch, and a secondary-side full-bridge rectifier module or a secondary-side half-wave rectifier module. The high-voltage input power supply is connected to the input terminal of the half-bridge LLC, the first output branch is connected to the secondary winding S1 of the half-bridge LLC, and the second output branch is connected to the secondary winding S2 of the half-bridge LLC. The secondary-side full-bridge rectifier module is connected to the first output branch, and one end of the secondary-side full-bridge rectifier module is connected to the second output branch; or the secondary-side half-wave rectifier module is connected to the first output branch. By adding a secondary full-bridge rectifier module or a secondary half-wave rectifier module to the automotive isolated DC circuit, the first output branch and the second output branch can output 12V and 24V voltages respectively. The appropriate output voltage of 24V or 12V can be selected according to the power supply requirements of the load equipment.

[0019] The number of windings in the secondary winding S1 is equal to the number of windings in the secondary winding S2. Using the same number of windings in the secondary windings S1 and S2 ensures that the harmonic waveforms generated in the circuit are consistent, avoiding crosstalk between transformers and the generation of a large amount of harmonic current.

[0020] like Figure 2 As shown, when the first output branch is connected to the secondary full-bridge rectifier module, the first output branch includes diode D3, capacitor C2, resistor R2, and diodes D5, D6, and D7 of the secondary full-bridge rectifier module. The positive terminal of diode D3 is connected to the same-name terminal of the secondary winding S1 and the negative terminal of diode D5. The negative terminal of diode D3 is connected to the negative terminal of diode D6, one end of capacitor C2, and one end of resistor R2. The positive terminal of diode D5 is connected to the positive terminal of diode D7, the other end of capacitor C2, the other end of resistor R2, and is connected to the second output branch. The positive terminal of diode D6 is connected to the negative terminal of diode D7 and is connected to the second output branch. The output terminal Vout1 of the first output branch is located between capacitor C2 and resistor R2.

[0021] The second output branch includes diode D4, capacitor C4, and resistor R1. The same-name terminals of the secondary winding S2 are connected to one end of capacitor C4 and one end of resistor R1, respectively. The opposite-name terminals of the secondary winding S2 are connected to the negative terminal of diode D4 and the positive terminal of diode D6, respectively. The positive terminal of diode D4 is connected to the other end of capacitor C4, the other end of resistor R1, and the positive terminal of diode D5, respectively. The output terminal Vout2 of the second output branch is located between capacitor C4 and resistor R1.

[0022] Figure 2Based on the original circuit, freewheeling diodes D5, D6, and D7 are added to the secondary winding of the output transformer. The voltages across the secondary windings S1 and S2 are then rectified using a full-bridge rectifier. Through the filter capacitor C2, the output Vout1 satisfies the relationship Vout1 = 2 × Vout2. By setting Vout2 to 12V, the transformer secondary winding, through full-bridge rectification, can output Vout1 at 24V. This allows for the selection of either 24V or 12V as the appropriate output voltage based on the power supply requirements of the load equipment.

[0023] like Figure 3 As shown, when the first output branch is connected to the secondary half-wave rectifier module, the first output branch includes diode D3, capacitor C2, and resistor R2. The secondary half-wave rectifier module includes diode D5. The same-name terminals of the secondary winding S1 are connected to the negative terminal of diode D3 and the positive terminal of diode D5, respectively. The negative terminal of diode D5 is connected to one end of capacitor C2 and one end of resistor R2, respectively. The positive terminal of diode D3 is connected to the second output branch. The other end of capacitor C2 and the other end of resistor R2 are connected to the second output branch, respectively. The output terminal Vout1 of the first output branch is located between capacitor C2 and resistor R2.

[0024] The second output branch includes diode D4, capacitor C4, and resistor R1. The same-named terminals of the secondary winding S2 are connected to the other end of capacitor C2, the other end of resistor R2, one end of capacitor C4, and one end of resistor R1, respectively. The opposite-named terminals of the secondary winding S2 are connected to the negative terminal of diode D4. The positive terminal of diode D4 is connected to the positive terminal of diode D3, the other end of capacitor C4, the other end of resistor R1, and ground, respectively. The output terminal Vout2 of the second output branch is located between capacitor C4 and resistor R1.

[0025] Figure 3 Based on the original circuit, a freewheeling diode D5 is added to the output transformer winding S1. The freewheeling diode D5 performs half-wave rectification. Capacitor C2 and resistor R2 are the loads requiring power. The secondary windings S1 and S2 are wound on the same magnetic core, and the number of windings in secondary winding S1 is equal to the number of windings in secondary winding S2. This utilizes the transformer's secondary winding S1 to perform half-wave rectification through the freewheeling diode D5 and capacitor C2 to output a voltage Vout1. Because it's half-wave rectification, the relationship Vout1 = 1 / 2 × Vout2 is satisfied. Thus, setting Vout2 to 24V allows Vout1 to output 12V, enabling the selection of an appropriate output voltage of 24V or 12V based on the power supply requirements of the load equipment.

[0026] The input of the half-bridge LLC includes a primary winding P1 and a primary modulation module. The primary modulation module includes MOSFETs Q1 and Q2, diodes D1 and D2, polarized capacitors C3 and C1, and inductors L1 and L2. The source of MOSFET Q1 is connected to the gate of MOSFET Q1, the drain of MOSFET Q2, and one end of inductor L1. The drain of MOSFET Q1 is connected to the positive terminal of the high-voltage input power supply, the negative terminal of diode D1, and the... The positive terminal of capacitor C3 and the source terminal of MOSFET Q2 are connected to the gate of MOSFET Q2, the negative terminal of the high-voltage input power supply, the positive terminal of diode D2, the negative terminal of polarized capacitor C1, and ground. The negative terminal of diode D2 is connected to the positive terminal of polarized capacitor C1, the positive terminal of diode D1, the negative terminal of polarized capacitor C3, one end of inductor L2, and the opposite-named terminal of primary winding P1. The other end of inductor L1 is connected to the other end of inductor L2 and the same-named terminal of primary winding P1. The high-voltage input power supply is distributed to the primary winding P1 after being modulated by PWM of MOSFETs Q1 and Q2. By adjusting the pulse width and frequency, precise control of the input voltage or current can be achieved.

[0027] This automotive output power compatibility circuit enables a single power module to output voltage compatible with both 24V and 12V automotive electronic low-voltage power supplies. In different regions and different automotive low-voltage applications, the same module can be used by changing only the interface position for both 24V and 12V systems, greatly simplifying the design and maintenance of automotive low-voltage power supply systems.

[0028] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A car output power compatible circuit, characterized in that, The system includes a half-bridge LLC, a high-voltage input power supply, a first output branch, a second output branch, and a secondary-side full-bridge rectifier module or a secondary-side half-wave rectifier module. The high-voltage input power supply is connected to the input terminal of the half-bridge LLC. The first output branch is connected to the secondary winding S1 of the half-bridge LLC, and the second output branch is connected to the secondary winding S2 of the half-bridge LLC. The secondary-side full-bridge rectifier module is connected to the first output branch, and one end of the secondary-side full-bridge rectifier module is connected to the second output branch; or the secondary-side half-wave rectifier module is connected to the first output branch.

2. The automotive output power compatible circuit according to claim 1, characterized in that, When the first output branch is connected to the secondary full-bridge rectifier module, the first output branch includes diode D3, capacitor C2, and resistor R2. The secondary full-bridge rectifier module includes diodes D5, D6, and D7. The anode of diode D3 is connected to the same-name terminal of the secondary winding S1 and the cathode of diode D5. The cathode of diode D3 is connected to the cathode of diode D6, one end of capacitor C2, and one end of resistor R2. The anode of diode D5 is connected to the anode of diode D7, the other end of capacitor C2, the other end of resistor R2, and is connected to the second output branch. The anode of diode D6 is connected to the cathode of diode D7 and is connected to the second output branch. The output terminal Vout1 of the first output branch is located between capacitor C2 and resistor R2.

3. The automotive output power compatible circuit according to claim 2, characterized in that, The second output branch includes diode D4, capacitor C4, and resistor R1. The same-name terminals of the secondary winding S2 are connected to one end of capacitor C4 and one end of resistor R1, respectively. The opposite-name terminals of the secondary winding S2 are connected to the negative terminal of diode D4 and the positive terminal of diode D6, respectively. The positive terminal of diode D4 is connected to the other end of capacitor C4, the other end of resistor R1, and the positive terminal of diode D5, respectively. The output terminal Vout2 of the second output branch is located between capacitor C4 and resistor R1.

4. The automotive output power compatible circuit according to claim 1, characterized in that, When the first output branch is connected to the secondary half-wave rectifier module, the first output branch includes diode D3, capacitor C2, and resistor R2. The secondary half-wave rectifier module includes diode D5. The same-name terminals of the secondary winding S1 are respectively connected to the negative terminal of diode D3 and the positive terminal of diode D5. The negative terminal of diode D5 is respectively connected to one end of capacitor C2 and one end of resistor R2. The positive terminal of diode D3 is connected to the second output branch. The other end of capacitor C2 and the other end of resistor R2 are respectively connected to the second output branch. The output terminal Vout1 of the first output branch is located between capacitor C2 and resistor R2.

5. The automotive output power compatible circuit according to claim 4, characterized in that, The second output branch includes a diode D4, a capacitor C4, and a resistor R1. The same-named terminals of the secondary winding S2 are respectively connected to the other end of capacitor C2, the other end of resistor R2, one end of capacitor C4, and one end of resistor R1. The opposite-named terminals of the secondary winding S2 are connected to the negative terminal of diode D4. The positive terminal of diode D4 is respectively connected to the positive terminal of diode D3, the other end of capacitor C4, the other end of resistor R1, and ground. The output terminal Vout2 of the second output branch is located between capacitor C4 and resistor R1.

6. The automotive output power compatible circuit according to claim 1, characterized in that, The number of windings in the secondary winding S1 is equal to the number of windings in the secondary winding S2.

7. The automotive output power compatible circuit according to claim 1, characterized in that, The input terminal of the half-bridge LLC includes a primary winding P1 and a primary modulation module. The primary modulation module includes MOSFETs Q1 and Q2, diodes D1 and D2, polarized capacitors C3 and C1, and inductors L1 and L2. The source of MOSFET Q1 is connected to the gate of MOSFET Q1, the drain of MOSFET Q2, and one end of inductor L1. The drain of MOSFET Q1 is connected to the positive terminal of the high-voltage input power supply and the negative terminal of diode D1. The positive terminal of polarized capacitor C3 is connected to the gate of MOSFET Q2, the negative terminal of the high-voltage input power supply, the positive terminal of diode D2, the negative terminal of polarized capacitor C1, and ground. The negative terminal of diode D2 is connected to the positive terminal of polarized capacitor C1, the positive terminal of diode D1, the negative terminal of polarized capacitor C3, one end of inductor L2, and the opposite-named terminal of primary winding P1. The other end of inductor L1 is connected to the other end of inductor L2 and the same-named terminal of primary winding P1.

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