Switching detection circuit and switching power supply based on new energy vehicle

Abstract

The utility model provides a kind of switch detection circuit and switching power supply based on new energy automobile, it includes detection circuit, small current loop and large current loop;One end of the detection circuit is connected with load, the other end of the detection circuit is connected with control circuit;One end of the small current loop is connected with the load, the other end of the small current loop is grounded;One end of the large current loop is connected with the load, the other end of the large current loop is grounded.The utility model can satisfy the detection requirement of wide current, realizes the switch detection to load under wide current.

Description

Technical Field

[0001] This utility model relates to the field of switch detection technology, specifically to a switch detection circuit and switching power supply based on new energy vehicles. Background Technology

[0002] With the popularization of new energy vehicles, various application products on these vehicles have also developed. Currently, most new energy vehicles have a wide voltage output of 9-16V, thus requiring load switching detection. The commonly used detection method is resistance sampling. However, because automotive power supplies have a wide voltage output, choosing a resistor that is too small may cause the MCU to fail to detect the signal, while choosing a resistor that is too large may cause the sampling voltage to exceed the MCU's withstand voltage, resulting in MCU damage. Utility Model Content

[0003] This invention provides a switch detection circuit for new energy vehicles, aiming to solve the problem that there is currently no switch detection circuit for new energy vehicles that is compatible with a wide voltage range.

[0004] In a first aspect, this utility model provides a switch detection circuit based on new energy vehicles, which includes a detection circuit, a small current loop, and a large current loop; one end of the detection circuit is connected to the load, and the other end of the detection circuit is connected to the control circuit; one end of the small current loop is connected to the load, and the other end of the small current loop is grounded; one end of the large current loop is connected to the load, and the other end of the large current loop is grounded.

[0005] Furthermore, the detection circuit includes a first resistor; one end of the first resistor is connected to the load, and the other end of the first resistor is connected to the control circuit.

[0006] Furthermore, the low-current loop includes a second resistor; one end of the second resistor is connected to the load, and the other end of the second resistor is grounded.

[0007] Furthermore, the high-current circuit includes a first diode; the positive terminal of the first diode is connected to the load, and the load of the first diode is grounded.

[0008] Furthermore, the first diode is a rectifier diode.

[0009] Furthermore, the high-current circuit includes a second diode; the positive terminal of the second diode is connected to the negative terminal of the first diode, and the negative terminal of the second diode is grounded.

[0010] Furthermore, the second diode is a rectifier diode.

[0011] Furthermore, it also includes a filter circuit, one end of which is connected to the detection circuit, and the other end of which is grounded.

[0012] Furthermore, the filtering circuit includes a filtering capacitor, one end of which is connected to the detection circuit, and the other end of which is grounded.

[0013] Secondly, this utility model also provides a switching power supply, which includes a control circuit and the switching detection circuit based on new energy vehicles as described in any of the above claims.

[0014] This utility model discloses a switching power supply including a control circuit and a switching detection circuit based on new energy vehicles. The switching detection circuit based on new energy vehicles includes a detection circuit, a low-current loop, and a high-current loop. The load is connected to the control circuit through the detection circuit, which facilitates the control circuit to perform switching detection. At the same time, both the low-current loop and the high-current loop are connected to the load. When the load current is small, the load is connected to the low-current loop to ensure that the control circuit can detect the signal. When the load current is large, the load is connected to the high-current loop to ensure that the control circuit can detect the signal while avoiding damage to the control circuit due to excessive current. This can meet the wide current detection requirements. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a block diagram of a switch detection circuit based on a new energy vehicle according to an embodiment of the present invention;

[0017] Figure 2 This is a block diagram of a switch detection circuit based on a new energy vehicle provided in another embodiment of the present invention;

[0018] Figure 3 This is a circuit diagram of a switch detection circuit based on a new energy vehicle provided in one embodiment of the present invention. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be understood that, when used in this specification and the appended claims, the terms “comprising” and “including” indicate the presence of the described features, integrals, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, operations, elements, components and / or collections thereof.

[0021] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0022] Furthermore, the directional terms used in this invention, such as "up," "down," "front," "back," "left," "right," "inner," "outer," and "side," are only for reference to the accompanying drawings and the product's usage state. Therefore, the directional terms used are for explaining and understanding this invention, and not for limiting it. Additionally, in the accompanying drawings, structures that are similar or identical are indicated by the same reference numerals.

[0023] See Figures 1 to 3 , Figure 1 This is a block diagram of a switch detection circuit 100 based on a new energy vehicle according to an embodiment of the present invention; Figure 2 This is a block diagram of a switch detection circuit 100 based on a new energy vehicle provided in another embodiment of the present invention; Figure 3 This is a circuit diagram of a switch detection circuit 100 based on a new energy vehicle, provided in one embodiment of this utility model. Figures 1 to 3As shown, the switch detection circuit 100 based on new energy vehicles includes a detection circuit 10, a small current loop 20, and a large current loop 30; one end of the detection circuit 10 is connected to the load 300, and the other end of the detection circuit 10 is connected to the control circuit 200; one end of the small current loop 20 is connected to the load 300, and the other end of the small current loop 20 is grounded; one end of the large current loop 30 is connected to the load 300, and the other end of the large current loop 30 is grounded.

[0024] Specifically, the switching power supply may include a control circuit 200 and a switch detection circuit 100 based on new energy vehicles. The control circuit 200 is connected to the load 300 through the switch detection circuit 100 based on new energy vehicles and is used to detect the switching state of the load 300 to support control logic or state judgment related to the load 300.

[0025] The control circuit 200 may include an MCU, which may include a detection port connected to one end of the switch detection circuit 100 based on new energy vehicles. The other end of the switch detection circuit 100 based on new energy vehicles is connected to the load 300. The switch detection circuit 100 based on new energy vehicles may include a detection circuit 10, a small current loop 20, and a large current loop 30. The detection circuit 10 is connected to the MCU of the control circuit 200, and is also connected to the load 300. The load 300 can output a detection signal to the MCU through the detection circuit 10, which allows the MCU to determine the switching state of the load 300.

[0026] One end of the low-current loop 20 is connected to the load 300, and the other end of the low-current loop 20 is grounded. It is used to sample the load current when the load current is small. One end of the high-current loop 30 is also connected to the load 300, and the other end is also grounded. It is used to sample the load current when the load current is large.

[0027] For example, when the load current is small, the load 300 is connected to the low-current loop 20 and the detection circuit 10. The detection signal is sent to the control circuit 200 through the detection circuit 10, and the control circuit 200 determines the switching state of the load 300 based on the detection signal. When the load current is large, the load 300 is connected to the high-current loop 30 and the detection circuit 10. The detection signal is sent to the control circuit 200 through the detection circuit 10, and the voltage exceeds the withstand voltage of the control circuit 200.

[0028] As a further embodiment, the detection circuit 10 includes a first resistor R1; one end of the first resistor R1 is connected to the load 300, and the other end of the first resistor R1 is connected to the control circuit 200.

[0029] The detection circuit 10 may include a first resistor R1, one end of which is connected to the load 300, and the other end of which is connected to the control circuit 200. The first resistor R1 is a sampling resistor used to detect the load current of the load 300, generate a detection signal, and then send the detection signal to the control circuit 200.

[0030] As a further embodiment, the low-current loop 20 includes a second resistor R2; one end of the second resistor R2 is connected to the load 300, and the other end of the second resistor R2 is grounded.

[0031] The low-current loop 20 includes a second resistor R2. One end of the second resistor R2 is connected to the load 300, and the other end is grounded. The second resistor R2 serves as the main path for the low-current flow and is used for load current sampling under low-current conditions. For example, when the load current I ≤ 40mA, the current mainly flows through the second resistor R2. At this time, the MCU's detection port voltage VAD = load current × resistance value of the second resistor R2. This voltage value reflects the magnitude of the load current, enabling the switching detection of the low-current load 300.

[0032] In a further embodiment, the high-current circuit 30 includes a first diode D1; the anode of the first diode D1 is connected to the load 300, and the load 300 is grounded. In a further embodiment, the first diode D1 is a rectifier diode. In a further embodiment, the high-current circuit 30 includes a second diode D2; the anode of the second diode D2 is connected to the cathode of the first diode D1, and the cathode of the second diode D2 is grounded. In a further embodiment, the second diode D2 is a rectifier diode.

[0033] The high-current resistor can include a first diode D1 and a second diode D2, which are connected in series. The positive terminal of the first diode D1 is connected to the load 300, and the negative terminal of the first diode D1 is connected to the positive terminal of the second diode D2. The negative terminal of the second diode D2 is grounded. The first diode D1 and the second diode D2 serve as the main path for the high current flow. Their series connection utilizes the forward voltage drop characteristics of the diodes to stabilize the sampling voltage under high current conditions. When the load current I > 40mA, the current mainly flows through the first diode D1 and the second diode D2. Since the forward voltage drop of each diode is approximately 0.7V, the voltage VAD at the MCU's detection port after series connection is approximately 2 × 0.7V = 1.4V. This avoids the problem of the voltage exceeding the MCU's withstand voltage that might occur when sampling through a resistor alone under high current conditions, ensuring the stability of the detection signal in high-current scenarios.

[0034] In a further embodiment, a filter circuit 40 is also included, one end of which is connected to the detection circuit 10, and the other end of which is grounded. In a further embodiment, the filter circuit 40 includes a filter capacitor C1, one end of which is connected to the detection circuit 10, and the other end of which is grounded.

[0035] The filtering circuit 40 may include a filtering capacitor C1. One end of the filtering capacitor C1 is connected to the detection circuit 10, and the other end of the filtering capacitor C1 is grounded. The filtering capacitor C1 is used to filter out high-frequency noise or voltage spikes in the circuit, stabilize the signal input to the MCU, avoid detection errors caused by interference, and protect subsequent circuits (such as the MCU's AD port) from voltage fluctuations.

[0036] This utility model also provides a switching power supply, which includes a control circuit 200 and a switching detection circuit 100 based on new energy vehicles as described in any of the above embodiments. The switching detection circuit 100 based on new energy vehicles includes a detection circuit 10, a small current loop 20, and a large current loop 30; one end of the detection circuit 10 is connected to a load 300, and the other end of the detection circuit 10 is connected to the control circuit 200; one end of the small current loop 20 is connected to the load 300, and the other end of the small current loop 20 is grounded; one end of the large current loop 30 is connected to the load 300, and the other end of the large current loop 30 is grounded.

[0037] Specifically, the switching power supply may include a control circuit 200 and a switch detection circuit 100 based on new energy vehicles. The control circuit 200 is connected to the load 300 through the switch detection circuit 100 based on new energy vehicles and is used to detect the switching state of the load 300 to support control logic or state judgment related to the load 300.

[0038] The control circuit 200 may include an MCU, which may include a detection port connected to one end of the switch detection circuit 100 based on new energy vehicles. The other end of the switch detection circuit 100 based on new energy vehicles is connected to the load 300. The switch detection circuit 100 based on new energy vehicles may include a detection circuit 10, a small current loop 20, and a large current loop 30. The detection circuit 10 is connected to the MCU of the control circuit 200, and is also connected to the load 300. The load 300 can output a detection signal to the MCU through the detection circuit 10, which allows the MCU to determine the switching state of the load 300.

[0039] One end of the low-current loop 20 is connected to the load 300, and the other end of the low-current loop 20 is grounded. It is used to sample the load current when the load current is small. One end of the high-current loop 30 is also connected to the load 300, and the other end is also grounded. It is used to sample the load current when the load current is large.

[0040] For example, when the load current is small, the load 300 is connected to the low-current loop 20 and the detection circuit 10. The detection signal is sent to the control circuit 200 through the detection circuit 10, and the control circuit 200 determines the switching state of the load 300 based on the detection signal. When the load current is large, the load 300 is connected to the high-current loop 30 and the detection circuit 10. The detection signal is sent to the control circuit 200 through the detection circuit 10, and the voltage exceeds the withstand voltage of the control circuit 200.

[0041] The switch detection circuit for new energy vehicles disclosed in this utility model connects the load to the control circuit through the detection circuit, which facilitates the switch detection of the control circuit. At the same time, both the low-current loop and the high-current loop are connected to the load. When the load current is small, the load is connected to the low-current loop to ensure that the control circuit can detect the signal. When the load current is large, the load is connected to the high-current loop to ensure that the control circuit can detect the signal while avoiding damage to the control circuit due to excessive current. This can meet the wide current detection requirements.

[0042] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A switch detection circuit based on new energy vehicles, characterized in that, include: A detection circuit, one end of which is connected to a load and the other end of which is connected to a control circuit; A small current loop, one end of which is connected to the load and the other end of which is grounded; A high-current loop, one end of which is connected to the load and the other end of which is grounded.

2. The switch detection circuit based on new energy vehicles as described in claim 1, characterized in that, The detection circuit includes a first resistor; One end of the first resistor is connected to the load, and the other end of the first resistor is connected to the control circuit.

3. The switch detection circuit based on new energy vehicles as described in claim 1, characterized in that, The low-current circuit includes a second resistor; One end of the second resistor is connected to the load, and the other end of the second resistor is grounded.

4. The switch detection circuit based on new energy vehicles as described in claim 1, characterized in that, The high-current circuit includes a first diode; The positive terminal of the first diode is connected to the load, and the load of the first diode is grounded.

5. The switch detection circuit based on new energy vehicles as described in claim 4, characterized in that, The first diode is a rectifier diode.

6. The switch detection circuit based on new energy vehicles as described in claim 4, characterized in that, The high-current circuit includes a second diode; The positive terminal of the second diode is connected to the negative terminal of the first diode, and the negative terminal of the second diode is grounded.

7. The switch detection circuit based on new energy vehicles as described in claim 6, characterized in that, The second diode is a rectifier diode.

8. The switch detection circuit based on new energy vehicles as described in claim 1, characterized in that, It also includes a filter circuit, one end of which is connected to the detection circuit, and the other end of which is grounded.

9. The switch detection circuit based on new energy vehicles as described in claim 8, characterized in that, The filtering circuit includes a filtering capacitor, one end of which is connected to the detection circuit, and the other end of which is grounded.

10. A switching power supply, characterized in that, The switching power supply includes a control circuit and a switch detection circuit based on new energy vehicles as described in any one of claims 1-9.

Images