Novel PTC controller low-voltage impact prevention sleep circuit

Abstract

The utility model provides a novel PTC controller low pressure's hibernate circuit of anti -impact, include: first electric capacity, second electric capacity, first resistance, second resistance, third resistance, fourth resistance, MOS pipe, transistor, LED lamp, input power supply is electric connection with first electric capacity one end, first resistance one end and MOS pipe's drain respectively, MOS pipe's grid is electric connection with first electric capacity other end, first resistance other end, second resistance one end respectively, transistor's collector is electric connection with second resistance other end, transistor's emitter is electric connection with LED lamp's positive pole, transistor's base is electric connection with second electric capacity one end, third resistance one end, fourth resistance one end respectively, fourth resistance other end is electric connection with INH pin, LED lamp's negative pole, second electric capacity other end, third resistance other end ground connection. Have the advantages such as reducing power supply peak interference, low power consumption, good reliability and simple structure.

Description

Technical Field

[0001] This utility model relates to the field of PTC heater technology, specifically to a novel low-voltage anti-surge sleep circuit for a PTC controller. Background Technology

[0002] Currently, new energy vehicles have gradually gained acceptance from the public. These include fuel cell vehicles, hybrid vehicles, hydrogen fuel cell vehicles, and solar-powered vehicles. Most new energy vehicles sold in my country are currently hybrid or pure electric vehicles. Therefore, the power source is the primary power source for these vehicles. However, because the power supply in these vehicles is constantly in a charging and discharging state, power losses are significant, affecting the stability and safety of the power supply and posing potential risks to safe driving.

[0003] To address this issue, patent document CN109066573B discloses a power protection device for new energy vehicles, specifically disclosing a technical solution that includes a filter circuit, a control protection circuit, and a stable output circuit. The input terminal of the filter circuit is connected to the output terminal of the new energy vehicle power supply, the output terminal of the filter circuit is connected to the input terminal of the control protection circuit, the output terminal of the control protection circuit is connected to the input terminal of the stable output circuit, and the output terminal of the stable output circuit is connected to the power supply port.

[0004] The control and protection circuit includes an operational amplifier AR1. The non-inverting input of AR1 is connected to the output of the filter circuit through resistor R3 and grounded through capacitor C4. The inverting input of AR1 is connected to one end of resistors R4 and R5, with the other end of resistor R4 grounded. The output of AR1 is connected to the other end of resistor R5 and one end of resistor R6. The other end of resistor R6 is connected to contact 1 of adjustable resistor RP1. Contact 2 of adjustable resistor RP1 is connected to one end of resistor R7, the cathode of Zener diode DZ1, and the non-inverting input of operational amplifier AR2. The other end of resistor R7 is connected to ground in parallel with the anode of Zener diode DZ1. Contact 3 of adjustable resistor RP1 is connected to the stable output circuit. The input terminals of the op-amp AR2 are connected to one end of capacitor C5, and the output terminal of op-amp AR2 is connected to the other end of capacitor C5, the non-inverting input terminal of op-amp AR3, and the inverting input terminal of op-amp AR4. The inverting input terminal of op-amp AR3 is connected to contact 1 of resistor R8 and adjustable resistor RP2. The other end of resistor R8 is connected to a +12V power supply. Contacts 2 and 3 of adjustable resistor RP2 are connected to the non-inverting input terminal of op-amp AR4 and grounded through resistor R9. The output terminals of op-amp AR3 and AR4 are connected to the base of transistor Q1. The collector of transistor Q1 is connected to the output terminal of the filter circuit through resistor R10 and grounded through capacitor C6. The emitter of transistor Q1 is grounded.

[0005] The circuits in the aforementioned prior art suffer from problems such as power supply spike interference, excessive power consumption, and insufficient reliability. Utility Model Content

[0006] To address the problems existing in the prior art, the purpose of this utility model is to provide a novel low-voltage surge-resistant sleep circuit for PTC controllers, which reduces power supply spike interference, has low power consumption, high reliability, and a simple structure.

[0007] To achieve the above objectives, the technical solution of this utility model is as follows:

[0008] A novel low-voltage surge-resistant sleep circuit for a PTC controller includes:

[0009] A first capacitor, a second capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a MOSFET, a transistor, and an LED are connected. The input power supply is electrically connected to one end of the first capacitor, one end of the first resistor, and the drain of the MOSFET. The gate of the MOSFET is electrically connected to the other end of the first capacitor, the other end of the first resistor, and one end of the second resistor. The source of the MOSFET is electrically connected to the input power supply.

[0010] The collector of the transistor is electrically connected to the other end of the second resistor, the emitter of the transistor is electrically connected to the positive terminal of the LED, the base of the transistor is electrically connected to one end of the second capacitor, one end of the third resistor, and one end of the fourth resistor, respectively, the other end of the fourth resistor is electrically connected to the INH pin, and the negative terminal of the LED, the other end of the second capacitor, and the other end of the third resistor are grounded.

[0011] Furthermore, the transistor may be an NPN transistor or an N-channel MOS transistor.

[0012] This invention effectively suppresses input anomalies and protects the back-end electronic components of the PTC controller from breakdown risks by integrating a peak voltage absorption design (such as a resistor and capacitor network), significantly reducing operational failures caused by power supply fluctuations. Simultaneously, by utilizing the switching control functions of MOSFETs and transistors, the standby state of the PTC controller can be flexibly adjusted, reducing unnecessary power consumption and improving the endurance of the vehicle's low-voltage power supply. Furthermore, the circuit consists only of basic components such as resistors, transistors, and MOSFETs, resulting in a simple structure and low cost. Redundancy design and anti-interference optimization ensure high reliability, providing an efficient, economical, and stable solution for power management in new energy vehicles. Attached Figure Description

[0013] Figure 1 This is the circuit schematic diagram of this utility model. Detailed Implementation

[0014] In the description of this utility model, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Therefore, the inclusion of "first" and "second" features may explicitly or implicitly include one or more of those features. In the description of this utility model, "a number" means two or more, unless otherwise explicitly specified.

[0015] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0016] The utility model will be further described below with reference to the accompanying drawings and specific embodiments. The following description is merely exemplary and does not limit the scope of protection of the utility model.

[0017] Please refer to Figure 1 , Figure 1 What is revealed is a novel low-voltage surge-resistant sleep circuit for a PTC controller.

[0018] In this embodiment, the sleep circuit includes a first capacitor C33, a second capacitor C34, a first resistor R19, a second resistor R22, a third resistor R28, a fourth resistor R29, a MOSFET Q4, a transistor Q3, and an LED. The input power supply DC_IN is electrically connected to one end of the first capacitor C33, one end of the first resistor R19, and the drain of the MOSFET Q4. The gate of the MOSFET Q4 is electrically connected to the other end of the first capacitor C33, the other end of the first resistor R19, and one end of the second resistor R22. The source of the MOSFET Q4 is electrically connected to the output power supply LDO_IN.

[0019] The collector of transistor Q3 is electrically connected to the other end of the second resistor R22, the emitter of transistor Q3 is electrically connected to the positive terminal of the LED, the base of transistor Q3 is electrically connected to one end of the second capacitor C34, one end of the third resistor R28, and one end of the fourth resistor R29, respectively, the other end of the fourth resistor R29 is electrically connected to the INH pin, and the negative terminal of the LED, the other end of the second capacitor C34, and the other end of the third resistor R28 are grounded.

[0020] In this embodiment, transistor Q3 can be an NPN transistor Q3 or an N-channel MOS transistor Q4.

[0021] In this embodiment, the first capacitor C33 and the first resistor R19 are connected in parallel between the input power supply DC_IN and the output power supply LDO_IN. The first capacitor C33 provides a low-impedance path to quickly discharge high-frequency peak energy; the first resistor R19 limits the current to prevent excessive charging and discharging current. The circuit characteristics of (first capacitor C33 and first resistor R19) are used to absorb transient voltage spikes, suppress high-frequency noise, and prevent downstream circuits (such as MOSFET Q4 and PTC controller) from being damaged by overvoltage.

[0022] When MOSFET Q4 is turned on, power input is transmitted to the PTC controller, and the LED lights up; when it is turned off, power is cut off, and the LED turns off. When transistor Q3 is turned on, it pulls the gate of MOSFET Q4 low or high, thus controlling MOSFET Q4 to turn on. The LED serves as a power status indicator; when MOSFET Q4 is turned on, current flows through the LED and the second resistor R22, causing the LED to light up. The second resistor R22 acts as a current-limiting resistor to prevent damage to the LED due to overcurrent. The second capacitor C34 is used to filter out low-frequency noise, stabilize the output voltage, and enhance the system's anti-interference capability.

[0023] When the INH pin is pulled low by an external circuit (such as the body controller), the transistor Q3 or MOSFET Q4 is forcibly turned off through the third resistor R28 and the fourth resistor R29 (which may form a pull-down network), thus cutting off the power supply to the PTC controller.

[0024] The working principle of this utility model is as follows:

[0025] 1. During normal operation

[0026] The vehicle power supply is input from the DC_IN terminal. The current flows through the absorption circuit composed of the first capacitor C33 and the first resistor R19, and after filtering out the peak voltage, it supplies power to the back-end circuit.

[0027] The power supply current flows from the DC_IN terminal to the LDO_IN terminal, passing through the circuit composed of MOSFET Q4. When the voltage between the emitter and collector of transistor Q3 meets the conduction condition, transistor Q3 turns on, causing the gate voltage of MOSFET Q4 to decrease, turning on MOSFET Q4. Current flows to the PTC controller, and the LED lights up, indicating that the PTC controller is working.

[0028] 2. Peak voltage protection

[0029] When a voltage spike occurs in the vehicle power supply, the absorption circuit composed of the first capacitor C33 and the first resistor R19 can quickly absorb the voltage spike, prevent it from breaking down the downstream circuit, and ensure that the input voltage of the PTC controller fluctuates within the normal range.

[0030] 3. PTC controller shutdown function (to reduce power consumption)

[0031] When the host does not respond to the PTC controller for an extended period (more than 30 seconds or longer), the INH pin can be lowered by pulling down the voltage of INH through the vehicle body, causing transistor Q3 to turn off, which in turn turns off MOSFET Q4 and cuts off the power supply to the PTC controller, thereby reducing the power consumption of the vehicle's power supply.

[0032] Alternatively, the PTC controller can be triggered by a message sent from the vehicle body via a communication chip, causing it to pull down the voltage of its INH pin and shut down the power supply to the PTC controller.

[0033] This invention effectively suppresses input anomalies and protects the back-end electronic components of the PTC controller from breakdown risks by integrating a peak voltage absorption design (such as a resistor and capacitor network), significantly reducing operational failures caused by power supply fluctuations. Simultaneously, by utilizing the switching control functions of MOSFETs and transistors, the standby state of the PTC controller can be flexibly adjusted, reducing unnecessary power consumption and improving the endurance of the vehicle's low-voltage power supply. Furthermore, the circuit consists only of basic components such as resistors, transistors, and MOSFETs, resulting in a simple structure and low cost. Redundancy design and anti-interference optimization ensure high reliability, providing an efficient, economical, and stable solution for power management in new energy vehicles.

Claims

1. A novel PTC controller low-voltage impact-preventing sleep circuit, characterized in that, include: A first capacitor, a second capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a MOSFET, a transistor, and an LED are connected. The input power supply is electrically connected to one end of the first capacitor, one end of the first resistor, and the drain of the MOSFET. The gate of the MOSFET is electrically connected to the other end of the first capacitor, the other end of the first resistor, and one end of the second resistor. The source of the MOSFET is electrically connected to the input power supply. The collector of the transistor is electrically connected to the other end of the second resistor, the emitter of the transistor is electrically connected to the positive terminal of the LED, the base of the transistor is electrically connected to one end of the second capacitor, one end of the third resistor, and one end of the fourth resistor, respectively, the other end of the fourth resistor is electrically connected to the INH pin, and the negative terminal of the LED, the other end of the second capacitor, and the other end of the third resistor are grounded.

2. The novel PTC controller low-voltage anti-shock sleep circuit according to claim 1, characterized in that: The transistor can be an NPN transistor or an N-channel MOS transistor.

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