Positive and negative isolation power supply for Type-C power supply

Abstract

The utility model aims to provide the positive and negative isolated power supply for Type-C power supply, which is small in size, high in integration level, convenient in power supply and favorable for daily debugging and power supply. The circuit comprises a power supply input module, a power supply protection module and an isolation power supply module, the power supply input module is connected with an input power supply, the power supply protection module comprises a PMOS tube and a first resistor, a VBUS port of the power supply input module is connected with a source electrode of the PMOS tube, and a VBUS port of the isolation power supply module is connected with a second resistor. A drain electrode of the PMOS tube is connected to a VIN port of the isolation power supply module through the first resistor, and the isolation power supply module is connected to an output power supply. The isolation power supply is applied to the technical field of isolation power supplies.

Description

Technical Field

[0001] The utility model is applied to the technical field of isolated power supplies, and in particular relates to a positive and negative isolated power supply powered by Type-C. Background Art

[0002] The power supply mode of the existing isolated power supply module can be divided into five types according to the input voltage:

[0003] 1. AC Input Isolated Power Module: This type of isolated power module directly accepts AC input voltage and outputs DC voltage after rectification, filtering, and voltage regulation. It is suitable for applications that require power extraction from an AC power source; however, it requires additional rectification, filtering, and voltage regulation circuitry, increasing cost and complexity. It is also sensitive to input voltage fluctuations and noise, requiring additional voltage regulation and filtering.

[0004] 2. DC Input Isolated Power Module: This type of isolated power module accepts a DC input voltage and typically outputs a stable DC voltage after filtering and voltage regulation. It is suitable for applications powered by a DC power supply. It may require additional voltage conversion circuitry to adapt to different input voltages. The stability and ripple of the DC input voltage may affect the stability of the output voltage.

[0005] 3. USB input isolated power module: This type of isolated power module can provide power through the USB interface and is commonly found in portable devices or devices that need to be connected to a computer.

[0006] 4. Solar Input Isolated Power Module: This type of isolated power module accepts solar power from solar panels and, after battery management and conversion, outputs a stable voltage. It is suitable for solar-powered applications. However, the power output from solar panels is affected by weather and lighting conditions, resulting in unstable output voltage and power. Therefore, additional battery management and conversion circuitry is required to provide a stable output.

[0007] 5. Automotive power input isolated power modules: These modules accept power from the vehicle's power system and, after adapting and converting it, output a voltage suitable for the device. Commonly used in automotive electronic equipment, these modules are also known for their wide voltage fluctuations, requiring additional voltage regulation and adaptation circuitry to provide a stable output. Furthermore, electromagnetic interference and noise can affect output voltage stability. Therefore, there is a need for a Type-C powered, positive and negative isolated power supply that is compact, highly integrated, and conveniently powered, making it suitable for daily debugging and power supply applications. Utility Model Content

[0008] The technical problem to be solved by the utility model is to overcome the deficiencies of the existing technology and provide a Type-C powered positive and negative isolated power supply with small size, high integration, convenient power supply, and convenience for daily debugging and power supply use.

[0009] The technical solution adopted by the present invention is as follows: the present invention includes a power input module, a power protection module and an isolated power module, the power input module is connected to the input power supply, the power protection module includes a PMOS tube and a first resistor, the VBUS port of the power input module is connected to the source of the PMOS tube, the drain of the PMOS tube is connected to the VIN port of the isolated power module via the first resistor, and the isolated power module is connected to the output power supply.

[0010] As can be seen from the above scheme, this application uses the Type-C interface and the isolated power supply module for power supply, which is convenient to use, has high system integration, small size, and is conducive to daily debugging and power supply use. The power protection module plays a protective role for the circuit.

[0011] A preferred solution is that the power protection module further includes a current detection amplifier, a first operational amplifier, a second operational amplifier, a third operational amplifier, a fourth operational amplifier, a fifth operational amplifier, a sixth operational amplifier, a seventh operational amplifier, a second resistor, a third resistor, and a universal logic gate chip, wherein the input end of the current detection amplifier is connected to the two ends of the first resistor, the A port, the B port, and the C port of the universal logic gate chip are respectively connected to the output end of the first operational amplifier, the output end of the second operational amplifier, and the output end of the third operational amplifier, the non-inverting input end of the first operational amplifier is connected to the output end of the current detection amplifier, the inverting input end of the first operational amplifier is connected to the output end of the fourth operational amplifier, the non-inverting input end of the fourth operational amplifier is connected to the second resistor and the third resistor, the output end of the fifth operational amplifier is connected to the non-inverting input end of the second operational amplifier, the output end of the sixth operational amplifier is connected to the non-inverting input end of the third operational amplifier, and the inverting input end of the second operational amplifier and the inverting input end of the third operational amplifier are connected to the output end of the seventh operational amplifier.

[0012] A preferred solution is that the power protection module further includes a trigger, and a CLK port of the trigger is connected to the ERRO_TRIGGER pin of the universal logic gate chip.

[0013] A preferred solution is that the power protection module further includes a voltage regulator, and an IN port of the voltage regulator is connected to the VBUS port of the power input module.

[0014] A preferred solution is that the power input module includes a TYPE-C interface, a PD trigger chip and a fourth resistor, the CC1 port and CC2 port of the TYPE-C interface are connected to the corresponding ports of the PD trigger chip, and the GND port of the PD trigger chip is grounded through the fourth resistor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the utility model;

[0016] Figure 2 It is a circuit principle diagram of the utility model;

[0017] Figure 3 is a circuit schematic diagram of the power protection module;

[0018] Figure 4 is a circuit diagram of the voltage regulator. DETAILED DESCRIPTION

[0019] like Figures 1 to 3 As shown, in this embodiment, the utility model includes a power input module 1, a power protection module 2 and an isolated power module 3. The power input module 1 is connected to the input power supply, the power protection module 2 includes a PMOS tube Q1 and a first resistor R1, the VBUS port of the power input module 1 is connected to the source of the PMOS tube Q1, and the drain of the PMOS tube Q1 is connected to the VIN port of the isolated power module 3 through the first resistor R1, and the isolated power module 3 is connected to the output power supply.

[0020] The power protection module 2 primarily protects against overcurrent in the VBUS power loop and overvoltage output in the isolated power module 3. The core of the power protection module 2 is the PMOS transistor Q1, which controls the power switch of the isolated power module 3 to achieve this protection. The first resistor R1 acts as a sampling resistor, sampling the bus current flowing into the isolated power module 3 to prevent circuit damage caused by load overcurrent.

[0021] like Figures 2 to 3As shown, in this embodiment, the power protection module 2 further includes a current detection amplifier U3, a first operational amplifier U6, a second operational amplifier U8, a third operational amplifier U12, a fourth operational amplifier U5, a fifth operational amplifier U9, a sixth operational amplifier U13, a seventh operational amplifier U7, a second resistor R7, a third resistor R5 and a universal logic gate chip U20. The input end of the current detection amplifier U3 is connected to the two ends of the first resistor R1, and the A port, B port and C port of the universal logic gate chip U20 are respectively connected to the output end of the first operational amplifier U6, the output end of the second operational amplifier U8 and the output end of the third operational amplifier U12. The non-inverting input of the first operational amplifier U6 is connected to the output of the current detection amplifier U3, the inverting input of the first operational amplifier U6 is connected to the output of the fourth operational amplifier U5, the non-inverting input of the fourth operational amplifier U5 is connected to the second resistor R7 and the third resistor R5, the output of the fifth operational amplifier U9 is connected to the non-inverting input of the second operational amplifier U8, the output of the sixth operational amplifier U13 is connected to the non-inverting input of the third operational amplifier U12, and the inverting input of the second operational amplifier U8 and the inverting input of the third operational amplifier U12 are connected to the output of the seventh operational amplifier U7. The model of the current detection amplifier U3 is INA190A3IDCKR.

[0022] The voltage divider network (preset protection current value) composed of the second resistor R7 and the third resistor R5 is compared with the corresponding voltage value (CUR) of the current sampling through the fourth operational amplifier U5 through the first operational amplifier U6. If the actual current value exceeds the preset protection current value, that is, overcurrent, the first operational amplifier U6 outputs a high level to U7, otherwise it outputs a low level; the output voltages of the isolated positive and negative power supplies are respectively divided by the fifth operational amplifier U9 and the sixth operational amplifier U13, and the differential voltage is sampled before being converted into a single-ended voltage and inputted into the second operational amplifier U8 and the third operational amplifier U12 respectively to compare with the reference voltage OVP_VREF corresponding to the set overvoltage protection voltage. If it is overvoltage, a high level is output to the three-input OR gate of the seventh operational amplifier U7; otherwise, a low level is output to the seventh operational amplifier U7; the current CUR of the current sampling passes through the comparator, and if it is overcurrent, a high level is output to the seventh operational amplifier U7; otherwise, a low level is output to the seventh operational amplifier U7.

[0023] like Figures 2 to 4As shown, in this embodiment, the power protection module 2 also includes a trigger U11, and the CLK port of the trigger U11 is connected to the ERRO_TRIGGER pin of the universal logic gate chip U20. The circuit of the trigger U11 is a protection signal latch control circuit, and the main part is composed of a D trigger with a latching function. As shown in the table below, when the device is started, the signal is set high, first to a low level and then to a high level. At this time, `Q outputs a high level to start the device. When the protection signal jumps from a low level to a high level, the CLK pin generates a rising edge signal. At this time, Q outputs a high level, that is, the OTP alarm signal is a high level, and the external indicator light lights up to alarm; `Q outputs a low level, and the power supply of the isolated power module is turned off. When the pin level state does not change, the protected device will remain in the off state to achieve the purpose of protection.

[0024] Among them, the truth table of the trigger is:

[0025] like Figure 4 As shown, in this embodiment, the power protection module 2 further includes a voltage regulator U4, the IN port of which is connected to the VBUS port of the power input module 1. The model of the voltage regulator U4 is LT1521CST-5, and the voltage regulator U4 provides a stable 5V power supply for the entire protection circuit system.

[0026] like Figures 2 to 4 As shown, in this embodiment, the power input module 1 includes a TYPE-C interface J1, a PD trigger chip U2, and a fourth resistor R19. The CC1 and CC2 ports of the TYPE-C interface J1 are connected to the corresponding ports of the PD trigger chip U2, and the GND port of the PD trigger chip U2 is grounded via the fourth resistor R19. The PD trigger chip U2 is model FS312A and is powered by the TYPE-C interface J1. Using the PD trigger chip U2, according to the FS312A data sheet, the VBUS voltage can be adjusted to 5V, 9V, 12V, 15V, or 20V by changing the resistance value of the fourth resistor R19. Setting the fourth resistor R19 to 0R, that is, grounding FUNC, adjusts the VBUS voltage to 20V.

[0027] The voltage application definition table of the PD trigger chip is as follows:

[0028]

[0029] In this example, the isolated power supply module 3 adopts the isolated power supply module of Jinshengyang. The isolated power supply module 3 is mature and stable, has high power and small size, and is more suitable for use as an isolated power supply for type-C power supply.

[0030] In this embodiment, the Type-C powered positive and negative isolated power supply can be applied to a variety of power usage scenarios.

[0031] 1. Safety power supply for household appliances: Isolated power supplies are widely used in household appliances, such as electric toothbrushes and electric shavers, to ensure user safety and reduce the risk of electric shock.

[0032] 2. Medical equipment power supply: Medical equipment has very strict requirements on power supply. Isolated power supply is often used in medical equipment such as blood pressure monitors and blood glucose meters to ensure electrical safety and stability.

[0033] 3. Industrial control system power supply: Industrial control systems have high requirements on power supply stability and anti-interference capabilities. Isolated power supplies are often used in sensors, PLCs and other equipment to ensure normal operation of the system.

[0034] 4. Communication equipment power supply: Isolated power supply also has important applications in communication equipment, such as routers, switches, etc. It can provide stable power output and reduce electrical interference.

Claims

1. A Type-C powered positive and negative isolated power supply, characterized by: It comprises a power input module (1), a power protection module (2) and an isolated power module (3); the power input module (1) is connected to an input power supply; the power protection module (2) comprises a PMOS tube (Q1) and a first resistor (R1); the VBUS port of the power input module (1) is connected to the source of the PMOS tube (Q1); the drain of the PMOS tube (Q1) is connected to the VIN port of the isolated power module (3) via the first resistor (R1); and the isolated power module (3) is connected to the output power supply.

2. The positive and negative isolated power supply for Type-C power supply according to claim 1, characterized in that: The power protection module (2) further comprises a current detection amplifier (U3), a first operational amplifier (U6), a second operational amplifier (U8), a third operational amplifier (U12), a fourth operational amplifier (U5), a fifth operational amplifier (U9), a sixth operational amplifier (U13), a seventh operational amplifier (U7), a second resistor (R7), a third resistor (R5) and a universal logic gate chip (U20), wherein the input end of the current detection amplifier (U3) is connected to both ends of the first resistor (R1), and the A port, the B port and the C port of the universal logic gate chip (U20) are connected to the output end of the first operational amplifier (U6), the output end of the second operational amplifier (U8) and the output end of the third operational amplifier (U12) respectively. The non-inverting input terminal of the first operational amplifier (U6) is connected to the output terminal of the current detection amplifier (U3), the inverting input terminal of the first operational amplifier (U6) is connected to the output terminal of the fourth operational amplifier (U5), the non-inverting input terminal of the fourth operational amplifier (U5) is connected to the second resistor (R7) and the third resistor (R5), the output terminal of the fifth operational amplifier (U9) is connected to the non-inverting input terminal of the second operational amplifier (U8), the output terminal of the sixth operational amplifier (U13) is connected to the non-inverting input terminal of the third operational amplifier (U12), and the inverting input terminal of the second operational amplifier (U8) and the inverting input terminal of the third operational amplifier (U12) are connected to the output terminal of the seventh operational amplifier (U7).

3. The positive and negative isolated power supply for Type-C power supply according to claim 2, characterized in that: The power protection module (2) further comprises a trigger (U11), wherein a CLK port of the trigger (U11) is connected to an ERRO_TRIGGER pin of the universal logic gate chip (U20).

4. The positive and negative isolated power supply for Type-C power supply according to claim 1, characterized in that: The power protection module (2) further comprises a voltage stabilizer (U4), wherein an IN port of the voltage stabilizer (U4) is connected to the VBUS port of the power input module (1).

5. The positive and negative isolated power supply for Type-C power supply according to claim 1, characterized in that: The power input module (1) comprises a TYPE-C interface (J1), a PD trigger chip (U2) and a fourth resistor (R19); the CC1 port and the CC2 port of the TYPE-C interface (J1) are connected to the corresponding ports of the PD trigger chip (U2); and the GND port of the PD trigger chip (U2) is grounded via the fourth resistor (R19).

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