CN218976406U - A power supply circuit for intelligent automatic switching of high and low voltage input of charging pile - Google Patents

Abstract

The utility model discloses a power supply circuit for intelligently and automatically switching high and low voltage inputs of a charging pile, comprising a detection chip, a feedback circuit, a power supply circuit, a relay, and a resistance-capacitance step-down circuit; the power supply circuit is electrically connected to the first pin of the detection chip ; The feedback circuit is electrically connected to the fifth pin of the detection chip; the power supply circuit is electrically connected to the feedback circuit; both the power supply circuit and the feedback circuit are electrically connected to the relay; the second pin of the detection chip is electrically connected to the relay; Electrically connected to the relay. The input voltage is fed back to the detection chip through the feedback circuit. When the detection chip detects that the input voltage exceeds 264V, the detection chip controls the driving relay to make the relay pull in, so that the port of the input voltage is switched to the resistance-capacitance step-down circuit, and then through The resistance-capacitance step-down circuit is switched to the emergency high-voltage power supply circuit to supply power to the charging pile, preventing the charging pile from being damaged due to excessive input voltage, and greatly reducing the maintenance cost of personnel.

Description

A power supply circuit for intelligent automatic switching of high and low voltage input of charging pile

technical field

The utility model relates to the field of power supply circuits, in particular to a power supply circuit for intelligently and automatically switching high and low voltage inputs of charging piles.

Background technique

The input voltage of conventional charging piles is AC 176-264V. Due to the complex grid environment regardless of region, the input voltage of charging pile equipment often exceeds AC 264V, causing damage to charging pile equipment, thereby increasing personnel maintenance costs.

Utility model content

In order to overcome the defects of the prior art, the technical problem to be solved by this utility model is to propose a power supply circuit for intelligent automatic switching of high and low voltage input of the charging pile, so as to solve the problem that the input voltage of the charging pile equipment exceeds AC 264V, causing the charging pile equipment Damage, thereby increasing the problem of personnel maintenance costs.

For this purpose, the utility model adopts the following technical solutions:

The utility model provides a power supply circuit for intelligently and automatically switching high and low voltage input of a charging pile, comprising: a detection chip for detecting the input voltage, a feedback circuit for feeding back the input voltage to the detection chip, and a circuit for A power supply circuit, a relay, and a resistance-capacitance step-down circuit for the power supply of the detection chip;

The power supply circuit is electrically connected to the first pin of the detection chip; the feedback circuit is electrically connected to the fifth pin of the detection chip; the power supply circuit is electrically connected to the feedback circuit; the power supply circuit Both the feedback circuit and the relay are electrically connected; the second pin of the detection chip is electrically connected to the relay; the resistance-capacitance step-down circuit is electrically connected to the relay.

A further technical solution of the present invention is that the feedback circuit includes a first diode, a second diode, a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor ; Wherein, the second resistor and the third resistor are both adjustable resistors;

The first pin of the first diode is electrically connected to the first pin of the first resistor;

The second pins of the first resistor are all electrically connected to the first pins of the second resistor, the first pins of the fourth resistor, and the first pins of the first capacitor;

The second pin of the second resistor is electrically connected to the first pin of the third resistor;

The second pins of the third resistor are electrically connected to the second pins of the first capacitor and the first pins of the second diode;

The second pins of the second diode are electrically connected to the second pin of the fourth resistor, the first pin of the second capacitor, and the fifth pin of the detection chip.

A further technical solution of the present invention is that the power supply circuit includes a fifth resistor, a third capacitor, a fourth capacitor, a third diode, a fourth diode, and a fifth diode;

The first pin of the third diode, the first pin of the fourth capacitor, and the first pin of the fifth diode are all electrically connected to the first pin of the detection chip;

The second pins of the third diode are electrically connected to the first pin of the fifth resistor, the first pin of the third capacitor, and the first pin of the fourth diode ;

Both the second pin of the fifth resistor and the second pin of the third capacitor are electrically connected to the second pin of the first diode;

The second pin of the fourth diode, the second pin of the fourth capacitor, and the second pin of the fifth diode are all connected to the second pin of the third resistor, the second pin of the The first pin of the second diode is electrically connected;

The second pin of the first capacitor, the second pin of the third resistor, the second pin of the fourth diode, the second pin of the fourth capacitor, the fifth The second pin of the diode, the first pin of the second diode, and the second pin of the second capacitor are all connected to the first end of the first alternating current, the first end of the second alternating current, The first end of the seat, the fifth pin of the relay, and the fourth pin of the detection chip are electrically connected.

A further technical solution of the present invention is that the RC step-down circuit includes a sixth resistor and a fifth capacitor;

Both the first pin of the sixth resistor and the first pin of the fifth capacitor are electrically connected to the first pin of the relay;

Both the second pin of the sixth resistor and the second pin of the fifth capacitor are electrically connected to the second end of the second alternating current;

The second pin of the detection chip is electrically connected to the second pin of the relay;

The third pin of the relay, the fourth pin of the relay, the second pin of the first diode, the second pin of the fifth resistor, the second pin of the third capacitor The pins are all electrically connected to the second end of the first alternating current;

The second end of the socket is electrically connected to the sixth pin of the relay.

A further technical solution of the utility model is that it also includes a sixth diode for protecting the relay;

The first pin of the sixth diode is electrically connected to the second pin of the relay;

The second pin of the sixth diode is electrically connected to the fifth pin of the relay.

The beneficial effects of the utility model are:

The utility model provides a power supply circuit for intelligent automatic switching of high and low voltage input of charging piles, including a detection chip U for detecting the input voltage, a feedback circuit for feeding back the input voltage to the detection chip U, and a circuit for the detection chip U power supply circuit, relay K, and RC step-down circuit; the power supply circuit is electrically connected to the first pin 1 of the detection chip U; the feedback circuit is electrically connected to the fifth pin 5 of the detection chip U; the power supply circuit is connected to the feedback The circuit is electrically connected; both the power supply circuit and the feedback circuit are electrically connected to the relay K; the second pin of the detection chip U is electrically connected to the relay K;

In the above implementation, specifically, the detection chip U is powered by the power supply circuit, which can make the detection chip U work, and facilitate the detection chip U to complete the follow-up work; the input voltage is fed back to the detection chip U through the feedback circuit, and the detection chip U is detected. When the input voltage exceeds the set value of the mains voltage, for example, when it exceeds 264V, the detection chip U controls the driving relay K to make the relay K pull in, so that the port of the input voltage is switched to the resistance-capacitance step-down circuit, and then through the resistance-capacitance The step-down circuit is switched to the emergency high-voltage circuit to supply power to the charging pile, preventing the charging pile from being damaged due to excessive input voltage, and greatly reducing the maintenance cost of personnel; when the detection chip U detects that the input voltage is not higher than the mains voltage When the voltage is at a set value, such as not exceeding 264V, the charging pile is connected to the AC-DC switching power supply voltage converter through the socket connected to the relay K for power supply.

Description of drawings

Fig. 1 is a schematic diagram of a power supply circuit for intelligently and automatically switching high and low voltage inputs of a charging pile provided in this embodiment.

In the picture:

U, detection chip; K, relay; CON, seat; D2, first diode; ZD2, second diode; D1, third diode; D4, fourth diode; ZD1, fifth Diode; D3, the sixth diode; R2, the first resistor; VR2, the second resistor; VR1, the third resistor; R4, the fourth resistor; R1, the fifth resistor; RX1, the sixth resistor; C3, The first capacitor; C4, the second capacitor; C1, the third capacitor; C2, the fourth capacitor; CX1, the fifth capacitor.

Detailed ways

The technical scheme of the utility model will be further described below in conjunction with the accompanying drawings and through specific embodiments.

Fig. 1 is a schematic structural diagram of a power supply circuit for intelligently and automatically switching high and low voltage inputs of a charging pile provided in this embodiment, as shown in Fig. 1 .

A power supply circuit for intelligently and automatically switching high and low voltage inputs of charging piles, including a detection chip U for detecting input voltage, a feedback circuit for feeding back the input voltage to the detection chip U, and a power supply circuit for powering the detection chip U , a relay K, and a resistance-capacitance step-down circuit; the power supply circuit is electrically connected to the first pin 1 of the detection chip U; the feedback circuit is electrically connected to the fifth pin 5 of the detection chip U; the power supply circuit is electrically connected to the feedback circuit; power supply Both the circuit and the feedback circuit are electrically connected to the relay K; the second pin of the detection chip U is electrically connected to the relay K;

In the above implementation, specifically, the detection chip U is powered by the power supply circuit, which can make the detection chip U work, and facilitate the detection chip U to complete the follow-up work; the input voltage is fed back to the detection chip U through the feedback circuit, and the detection chip U is detected. When the input voltage exceeds the set value of the mains voltage, for example, when it exceeds 264V, the detection chip U controls the driving relay K to make the relay K pull in, so that the port of the input voltage is switched to the resistance-capacitance step-down circuit, and then through the resistance-capacitance The step-down circuit is switched to the emergency high-voltage circuit to supply power to the charging pile, preventing the charging pile from being damaged due to excessive input voltage, and greatly reducing the maintenance cost of personnel; when the detection chip U detects that the input voltage is not higher than the mains voltage When the voltage is at a set value, such as not exceeding 264V, the charging pile is connected to the AC-DC switching power supply voltage converter through the socket connected to the relay K for power supply.

Because the input voltage of the conventional charging pile is AC 176-264V, because the grid environment is more complicated regardless of the region, the input voltage of the charging pile will often exceed AC 264V, which will cause damage to the charging pile equipment, thereby increasing personnel maintenance costs. The power supply circuit provided by the utility model for the intelligent automatic switching of high and low voltage input of the charging pile can monitor the input voltage of the grid in real time and automatically switch to the emergency high voltage power supply circuit to prevent damage to the equipment and greatly reduce the maintenance of additional personnel cost. Among them, in specific implementation, the emergency high-voltage power supply circuit can be an emergency high-voltage AC-DC switching power supply voltage converter. This kind of emergency high-voltage power supply circuit has the advantage of low cost. The low-cost circuit is used for short-term emergency use of high-voltage input. The high-voltage shock time is very short, so the circuit cost and power supply are very low, but it can maintain the normal operation of the whole system.

A further technical solution of the present invention is that the feedback circuit includes a first diode D2, a second diode ZD2, a first resistor R2, a second resistor VR2, a third resistor VR1, a fourth resistor R4, a first capacitor C3, the second capacitor C4; wherein, the second resistor VR2 and the third resistor VR1 are adjustable resistors; the first pin of the first diode D2 is electrically connected to the first pin of the first resistor R2; the first The second pins of the resistor R2 are electrically connected to the first pins of the second resistor VR2, the first pins of the fourth resistor R4, and the first pins of the first capacitor C3; the second pins of the second resistor VR2 pins are electrically connected to the first pins of the third resistor VR1; the second pins of the third resistor VR1 are both electrically connected to the second pins of the first capacitor C3 and the first pins of the second diode ZD2; The second pins of the two diodes ZD2 are electrically connected to the second pin of the fourth resistor R4, the first pin of the second capacitor C4, and the fifth pin 5 of the detection chip U; the second pin of the second capacitor C4 The second pin is electrically connected to the fourth pin of the detection chip U.

In the above implementation, specifically, through the combination of the first diode D2, the first resistor R2, the second resistor VR2, the third resistor VR1, and the first capacitor C3, the resistance value of the second resistor VR2 is adjusted to 4.7K, After adjusting the resistance value of the third resistor VR1 to 10K, the current mains voltage is passed through the fourth resistor R4 of the current limiting resistor, and then filtered by the second diode ZD2 and the second capacitor C4 to stabilize the voltage and then feed back to the detection The fifth pin 5 of the chip U, when the detection chip U detects that the voltage exceeds 1.6V, at this time, the mains voltage is more than 264V, and then the second pin of the control terminal of the detection chip U, wherein the pins include two pins Pins, such as pins 2 and 3 in Figure 1, output the driving voltage to drive the relay K (the third/fourth pin of the relay K is a static contact pin, the second/fifth pin is a coil power supply pin, and the The first/sixth pin is the power supply pin of the dynamic contact normally open and normally closed switching pin) The second pin/fifth pin makes the relay K close, disconnects the sixth pin, and switches to the first pin , so that the power supply of the second terminal L of the first alternating current is switched to the resistance-capacitance step-down circuit, and then the second terminal L1 of the second alternating current supplies power to the emergency high-voltage power supply circuit inside the charging pile. The sixth diode D3 is the protection diode of relay K1. LED1 lights up to represent the voltage overvoltage state. Finally, when the voltage returns to below 264V, it returns to normal. LED1 is not lit, and relay K is in the off state. Among them, more specifically, the adjustment range is below 265V as the safe voltage, and the voltage of the seat CON is disconnected above 265V to ensure that the power supply of the charging pile does not work; adjust the second resistor VR2 and the third resistor VR1 of the adjustable resistor to make the second two poles The tube ZD2 enters the breakdown range, causing the voltage of the fifth pin 5 of the detection chip U to drop, start the control terminal 2 and 3 pins of the detection chip U, and pull in the relay, so that the seat CON has no output, and the LED lights up, indicating that the voltage is too high pressure, or neutral loss.

Wherein, the specific values of each device in the utility model are as shown in Figure 1, and are not repeated here; in addition, the initial value of the second resistor VR2 of the adjustable resistor, the initial value of the third resistor VR1 of the adjustable resistor Both are 50K; the model used by the seat CON is VH3.96/2P; the model used by the relay is HFD23/012-1ZS; the model used by the detection chip U is TWH8778.

A further technical solution of the present invention is that the power supply circuit includes a fifth resistor R1, a third capacitor C1, a fourth capacitor C2, a third diode D1, a fourth diode D4, and a fifth diode ZD1; The first pin of the third diode D1, the first pin of the fourth capacitor C2, and the first pin of the fifth diode ZD1 are all electrically connected to the first pin 1 of the detection chip U; the third diode The second pins of the tube D1 are electrically connected to the first pins of the fifth resistor R1, the first pins of the third capacitor C1, and the first pins of the fourth diode D4; the second pins of the fifth resistor R1 pin, the second pin of the third capacitor C1 are electrically connected to the second pin of the first diode; the second pin of the fourth diode D4, the second pin of the fourth capacitor C2, the second pin of the first diode The second pins of the five diodes ZD1 are electrically connected to the second pins of the third resistor and the first pins of the second diode ZD2; the second pins of the first capacitor and the second pins of the third resistor pin, the second pin of the fourth diode D4, the second pin of the fourth capacitor C2, the second pin of the fifth diode ZD1, the first pin of the second diode ZD2, the second pin of the The second pins of the two capacitors C4 are all connected to the first end N of the first alternating current, the first end N of the second alternating current, the first end of the seat, the fifth pin 5 of the relay K, and the fourth pin of the detection chip U. Pin 4 is electrically connected.

In the above implementation, specifically, the bridge rectification power supply circuit composed of the fifth resistor R1, the third capacitor C1, the third diode D1, and the fourth diode D4 is used to provide power to the whole circuit, and the fourth capacitor C2 The fifth diode ZD1 supplies the input power to the detection chip U after the 12V voltage is stabilized. Wherein, the first pin of the detection chip U is an input voltage pin, the second pins 2 and 3 of the detection chip U are output voltage pins, the fourth pin 4 of the detection chip U is a ground pin, and the detection chip U The fifth pin 5 is a pin for detecting the input voltage fed back by the feedback circuit.

The further technical scheme of the utility model is that the RC step-down circuit includes a sixth resistor RX1 and a fifth capacitor CX1; the first pin of the sixth resistor RX1 and the first pin of the fifth capacitor CX1 are connected with the relay K The first pin is electrically connected; the second pin of the sixth resistor RX1 and the second pin of the fifth capacitor CX1 are electrically connected to the second end L1 of the second alternating current; the second pin 2 of the detection chip U is connected to the relay The second pin 2 of K is electrically connected; the third pin 3 of the relay K, the fourth pin 4 of the relay K, the second pin of the first diode D2, the second pin of the fifth resistor R1, The second pins of the third capacitor C1 are electrically connected to the second end L of the first alternating current; the second end of the seat CON is electrically connected to the sixth pin 6 of the relay K.

The further technical solution of the utility model is that it also includes a sixth diode D3 for protecting the relay K; the first pin of the sixth diode D3 is electrically connected with the second pin 2 of the relay K; the sixth The second pin of the diode D3 is electrically connected with the fifth pin 5 of the relay K.

The utility model is described through preferred embodiments, and those skilled in the art know that various changes or equivalent replacements can be made to these features and embodiments without departing from the spirit and scope of the utility model. The utility model is not limited by the specific embodiments disclosed here, and other embodiments falling within the claims of the application all belong to the protection scope of the utility model.

Claims (5)

1. A power supply circuit for charging pile intelligent automatic switching high and low voltage input, characterized in that it comprises: A detection chip for detecting the input voltage, a feedback circuit for feeding back the input voltage to the detection chip, a power supply circuit for supplying power to the detection chip, a relay, and a resistance-capacitance step-down circuit; The power supply circuit is electrically connected to the first pin of the detection chip; the feedback circuit is electrically connected to the fifth pin of the detection chip; the power supply circuit is electrically connected to the feedback circuit; the power supply circuit Both the feedback circuit and the relay are electrically connected; the second pin of the detection chip is electrically connected to the relay; the resistance-capacitance step-down circuit is electrically connected to the relay. 2. A power supply circuit for charging piles intelligently and automatically switching between high and low voltage inputs according to claim 1, characterized in that: The feedback circuit includes a first diode, a second diode, a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, and a second capacitor; wherein, the second resistor, the The third resistor mentioned above is an adjustable resistor; The first pin of the first diode is electrically connected to the first pin of the first resistor; The second pins of the first resistor are all electrically connected to the first pins of the second resistor, the first pins of the fourth resistor, and the first pins of the first capacitor; The second pin of the second resistor is electrically connected to the first pin of the third resistor; The second pins of the third resistor are electrically connected to the second pins of the first capacitor and the first pins of the second diode; The second pins of the second diode are electrically connected to the second pin of the fourth resistor, the first pin of the second capacitor, and the fifth pin of the detection chip. 3. A power supply circuit for charging piles intelligently and automatically switching high and low voltage inputs according to claim 2, characterized in that: The power supply circuit includes a fifth resistor, a third capacitor, a fourth capacitor, a third diode, a fourth diode, and a fifth diode; The first pin of the third diode, the first pin of the fourth capacitor, and the first pin of the fifth diode are all electrically connected to the first pin of the detection chip; The second pins of the third diode are electrically connected to the first pin of the fifth resistor, the first pin of the third capacitor, and the first pin of the fourth diode ; Both the second pin of the fifth resistor and the second pin of the third capacitor are electrically connected to the second pin of the first diode; The second pin of the fourth diode, the second pin of the fourth capacitor, and the second pin of the fifth diode are all connected to the second pin of the third resistor, the second pin of the The first pin of the second diode is electrically connected; The second pin of the first capacitor, the second pin of the third resistor, the second pin of the fourth diode, the second pin of the fourth capacitor, the fifth The second pin of the diode, the first pin of the second diode, and the second pin of the second capacitor are all connected to the first end of the first alternating current, the first end of the second alternating current, The first end of the seat, the fifth pin of the relay, and the fourth pin of the detection chip are electrically connected. 4. A power supply circuit for charging piles intelligently and automatically switching between high and low voltage inputs according to claim 3, characterized in that: The RC step-down circuit includes a sixth resistor and a fifth capacitor; Both the first pin of the sixth resistor and the first pin of the fifth capacitor are electrically connected to the first pin of the relay; Both the second pin of the sixth resistor and the second pin of the fifth capacitor are electrically connected to the second end of the second alternating current; The second pin of the detection chip is electrically connected to the second pin of the relay; The third pin of the relay, the fourth pin of the relay, the second pin of the first diode, the second pin of the fifth resistor, the second pin of the third capacitor The pins are all electrically connected to the second end of the first alternating current; The second end of the socket is electrically connected to the sixth pin of the relay. 5. A power supply circuit for charging piles intelligently and automatically switching high and low voltage inputs according to claim 4, characterized in that: Also includes a sixth diode for the protection relay; The first pin of the sixth diode is electrically connected to the second pin of the relay; The second pin of the sixth diode is electrically connected to the fifth pin of the relay.

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