CP duty ratio detection circuit

By designing a CP duty cycle detection circuit and using voltage divider and operational amplifier for voltage comparison, the safety hazards of CP duty cycle detection during the interaction between charging piles and new energy vehicles are solved, and low-cost safety detection is achieved.

CN223742614UActive Publication Date: 2025-12-30浙江智行微电子有限公司
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Patent Information

Application Number
CN202422662303.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-11-01
Publication Date
2025-12-30
Estimated Expiration
2034-11-01

AI Technical Summary

Technical Problem

In existing technologies, CP duty cycle detection poses a safety hazard during the interaction between charging piles and new energy vehicles, leading to overheating of the charging piles.

Method used

Design a CP duty cycle detection circuit, which uses the voltage divider of R540 and R542 to provide a comparison voltage, and combines diode D200 and operational amplifiers U1AA and U1AB to perform voltage comparison, thus realizing the detection of CP duty cycle with very few circuit components.

Benefits of technology

It achieves efficient and low-cost CP duty cycle detection, avoiding safety issues caused by overheating of charging piles.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a CP duty ratio detection circuit. The CP duty ratio detection circuit comprises U1A, R1, R2, R3, R4 and CP in an equipment controller (CP signal generator), U1AA, U1AB, R540, R541, R542, R543, R544, R545, CPFBD, CPO and diodes D200, D18A and D18B in the CP duty ratio detection circuit. According to the utility model, the partial voltage of the R540 and the R542 provides a comparison voltage, and after the negative voltage of the CPO is removed through the D200, the CPO is compared with the comparison voltage under the partial voltage of the R541 and the R543; if the voltage is larger than the comparison voltage, 3.3 V is output, if the voltage is smaller than the comparison voltage, 0V is output, and U1A power supply is + 12V voltage and-12V voltage respectively; in the operational amplification process, the R2 and the R1 are matched to provide reference voltage for the U1A; the CPMCU is a main MCU input end, the CP is a CP output of the power supply equipment, when the CPMCU is at a high level, the CP outputs a high level of 12V, otherwise, the CP outputs a low level of-12V, and CP duty ratio detection is realized through extremely low cost.
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Description

TECHNICAL FIELD

[0001] The utility model belongs to CP duty cycle detection technical field, especially related to a CP duty cycle detection circuit. BACKGROUND

[0002] In the mutual interaction of charging pile and new energy automobile, CP duty cycle has the maximum charging current of charging pile, once there is a problem, it can cause safety problem due to overheating of charging pile, so detect CP duty cycle, stop charging once there is a problem. UTILITY MODEL CONTENTS

[0003] In order to solve the above technical problem, the utility model provides a CP duty cycle detection circuit, realizes CP duty cycle detection by little cost.

[0004] A CP duty cycle detection circuit, including equipment controller (CP signal generator) U1A, R1, R2, R3, R4 and CP, R2 and R1 are electrically connected to the negative pole of U1A, and provide reference voltage for U1A in the process by R2 and R1 cooperation, CP_MCU is electrically connected to the positive pole of U1A, and the output end of U1A is electrically connected to CP, when CP_MCU is high level, CP outputs high level 12V, otherwise CP outputs low level-12V, the CP duty cycle detection circuit includes U1AA, U1AB, R540, R541, R542, R543, R544, R545, CPFBD, CP_O and diode D200 and D18A and D18B, R540 and R542 are electrically connected to the negative pole of U1AA, CP_O is electrically connected to the positive pole of U1AA, and diode D200 is arranged between CP_O and U1AA, wherein the voltage division of R540 and R542 provides comparison voltage, and CP_O removes negative voltage through D200, R541 and R543 are electrically connected to the positive pole of U1AA, and comparison voltage is compared under the voltage division of R541 and R543, U1AA is electrically connected to the positive pole of U1AB, and R544 and R545 are electrically connected in the intermediate circuit, the output end of U1AB is electrically connected to the input end of CPFBD, diode D18A and D18B are electrically connected between U1AB and CPFBD, and the negative pole of U1AB is electrically connected between U1AB and CPFBD.

[0005] Preferably, two diodes D1A and D1B are arranged between U1A and CP through R4.

[0006] Preferably, R3 is electrically connected to the positive pole of U1A.

[0007] Preferably, the R4 is electrically connected between the U1A and the CP to facilitate further voltage stabilization.

[0008] Preferably, the U1A is electrically connected to a 12V power supply.

[0009] Preferably, the U1AA is electrically connected to a 3.3V power supply.

[0010] Compared with the prior art, the CP duty cycle detection circuit has the following beneficial effects:

[0011] In the utility model, the voltage division of R540 and R542 provides a comparison voltage, and CP_O, after removing the negative voltage through D200, is compared with the comparison voltage under the voltage division of R541 and R543; if the comparison voltage is greater, 3.3V is output, and if the comparison voltage is smaller, 0V is output, wherein the power supply of U1A is +12V and -12V voltage respectively; during the operation of the operational amplifier, R2 and R1 cooperate to provide a reference voltage for U1A; CP_MCU is a main MCU input end, and CP is a CP output of a power supply device; when CP_MCU is high, CP outputs high 12V, and vice versa, low -12V, and through a small cost, the CP duty cycle detection is realized. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a CP signal generator circuit diagram of the utility model.

[0013] Figure 2 It is a circuit diagram of the CP duty cycle detection circuit of the utility model. CONCRETE IMPLEMENTATION

[0014] The utility model will be specifically described in combination with the drawings, such as the drawings Figure 1 As shown in a kind of CP duty cycle detection circuit, including equipment controller (CP signal generator) U1A, R1, R2, R3, R4 and CP, the R2 and R1 electrically connected anode of U1A, and during the operation, R2 and R1 cooperate to provide reference voltage for U1A;The CP_MCU electrically connected cathode of U1A and the output of the U1A is electrically connected CP, when CP_MCU is high, CP outputs high 12V, and vice versa, CP outputs low -12V.

[0015] As shown in a kind of CP duty cycle detection circuit, including equipment controller (CP signal generator) U1A, R1, R2, R3, R4 and CP, the R2 and R1 electrically connected anode of U1A, and during the operation, R2 and R1 cooperate to provide reference voltage for U1A;The CP_MCU electrically connected cathode of U1A and the output of the U1A is electrically connected CP, when CP_MCU is high, CP outputs high 12V, and vice versa, CP outputs low -12V. Figure 2As shown, CP duty cycle detection circuit includes U1AA, U1AB, R540, R541, R542, R543, R544, R545, CPFBD, CP_O and diodes D200 and D18A and D18B, the R540 and R542 are electrically connected to the negative of U1AA, the CP_O is electrically connected to the positive of U1AA, and the CP_O and U1AA are provided with diode D200, wherein the voltage division of R540 and R542 provides a comparison voltage, and CP_O removes negative voltage through D200; the R541 and R543 are electrically connected to the positive of U1AA, and the voltage division of R541 and R543 is compared with the comparison voltage; the U1AA is electrically connected to the positive of U1AB, and R544 and R545 are electrically connected in the intermediate circuit; the output end of U1AB is electrically connected to the input end of CPFBD; diodes D18A and D18B are electrically connected between U1AB and CPFBD; the negative of U1AB is electrically connected between U1AB and CPFBD.

[0016] In the embodiment, specifically, two diodes D1A and D1B are provided between U1A and CP through R4.

[0017] In the embodiment, specifically, the R3 is electrically connected to the positive of U1A.

[0018] In the embodiment, specifically, the R4 is electrically connected between U1A and CP to facilitate further voltage stabilization.

[0019] In the embodiment, specifically, the U1A is electrically connected to a 12V power supply.

[0020] In the embodiment, specifically, the U1AA is electrically connected to a 3.3V power supply.

[0021] In the embodiment, the power supply of U1A is +12V and -12V; wherein 3.3V, R2 and R1 provide reference voltage for U1A; CP_MCU is the output end of the main MCU, and CP is the CP output of the power supply equipment. When CP_MCU is high, CP outputs high (12V), and vice versa, low ( -12V), wherein the voltage division of R540 and R542 provides a comparison voltage, and CP_O removes negative voltage through D200, and then compares with the comparison voltage under the voltage division of R541 and R543; if greater than the comparison voltage, 3.3V is output, and if less than the comparison voltage, 0V is output; the MCU calculates the duty cycle of high level to realize CP duty cycle detection.

[0022] The technical scheme of the utility model, or the technical scheme inspired by the technical scheme of the utility model, designs similar technical scheme, and achieves the above technical effect, and all falls into the protection range of the utility model.

Claims

1. A CP duty cycle detection circuit, characterized by, The CP duty cycle detection circuit, including the device controller U1A, R1, R2, R3, R4 and CP, the R2 and R1 electrically connected to the negative pole of U1A, and in the process by R2 and R1 for U1A to provide reference voltage; the CP_MCU electrically connected to the positive pole of U1A and the output of U1A electrically connected to CP, when CP_MCU is high CP output high level 12V, otherwise CP output low level -12V; the process CP duty cycle detection circuit including U1AA, U1AB, R540, R541, R542, R543, R544, R545, CPFBD, CP_O and diode D200 and D18A and D18B, the R540 and R542 electrically connected to the negative pole of U1AA, the CP_O electrically connected to the positive pole of U1AA, and the CP_O and U1AA between the diode D200, wherein R540 and R542 voltage divider provides a comparison voltage, CP_O through D200 to remove the negative pressure; the R541 and R543 electrically connected to the positive pole of U1AA, under the voltage divider of R541 and R543 and comparison voltage comparison; the U1AA electrically connected to the positive pole of U1AB, and in the intermediate circuit is electrically connected with R544 and R545; the output of U1AB electrically connected to the input of CPFBD; the U1AB and CPFBD between electrically connected with diode D18A and D18B; the U1AB and CPFBD between electrically connected at the same time electrically connected to the negative pole of U1AB.

2. The CP duty cycle detection circuit of claim 1, wherein, The U1A and CP between R4 electrically connected to set up two diodes D1A and D1B.

3. The CP duty cycle detection circuit of claim 1, wherein, The R3 electrically connected to the positive pole of U1A.

4. The CP duty cycle detection circuit of claim 1, wherein, The R4 electrically connected between U1A and CP to facilitate further voltage stabilizing work.

5. The CP duty cycle detection circuit of claim 2, wherein, The U1A electrically connected to 12V power supply.

6. The CP duty cycle detection circuit of claim 1, wherein, The U1AA electrically connected to 3.3V power supply.