CN219417644U - Insulation detection circuit and vehicle-mounted charger - Google Patents
Insulation detection circuit and vehicle-mounted charger Download PDFInfo
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- CN219417644U CN219417644U CN202223482457.XU CN202223482457U CN219417644U CN 219417644 U CN219417644 U CN 219417644U CN 202223482457 U CN202223482457 U CN 202223482457U CN 219417644 U CN219417644 U CN 219417644U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The utility model relates to an insulation detection circuit and a vehicle-mounted charger, wherein the insulation detection circuit comprises: the device comprises a first voltage division module, a second voltage division module, a bias module, a peak value sampling module and a controller; the first voltage dividing module is used for collecting midpoint voltage of two poles of the alternating-current side of the vehicle-mounted charger at the midpoint when the vehicle-mounted charger reversely outputs alternating current; the second voltage dividing module is used for dividing the midpoint voltage and outputting divided voltage; the resistance value of the resistor in the first voltage division module is smaller than that of the resistor in the second voltage division module; the bias module is used for providing bias voltage; the peak sampling module is used for outputting peak voltage according to the bias voltage and the divided voltage; the controller is used for determining an insulation result of the vehicle-mounted charger according to the peak voltage. The insulation detection circuit provided by the embodiment of the utility model has a simpler structure and occupies smaller space.
Description
Technical Field
The utility model relates to the technical field of charging equipment, in particular to an insulation detection circuit and a vehicle-mounted charger.
Background
Along with the rapid development of the new energy electric automobile industry, the application requirements of the market on the vehicle-mounted charger are continuously expanded, and the industry development prospect is good. Along with the increase of the demands of the vehicle-mounted chargers, the functional demands put forward for the vehicle-mounted chargers are also increasing, and the bidirectional vehicle-mounted chargers are also increasingly used.
When the bidirectional vehicle-mounted charger is in a state of discharging and outputting alternating current, the insulation condition of the alternating current side line and the ground wire (also a vehicle body) of the bidirectional vehicle-mounted charger is related to the performance and safety problems of products, and if the insulation condition of the alternating current side line and the ground wire is abnormal, the device damage or the electric shock of personnel can be caused, so that the vehicle-mounted charger needs to detect the insulation condition of the alternating current output to the ground wire in real time when discharging and outputting.
The conventional real-time detection method for insulation detection on the ac side adopts an insulation detection scheme of a residual current transformer, which mainly detects residual current (ground fault current such as electric shock and electric leakage) of a main circuit passing through a transformer core, converts the residual current of a primary circuit into output voltage of a secondary circuit, and recognizes leakage current of the primary circuit by detecting the voltage of the secondary circuit, thereby judging insulation condition of the primary circuit. The insulation detection scheme adopting the residual current transformer has the defects of higher cost and large occupied space.
Disclosure of Invention
The utility model provides an insulation detection circuit and a vehicle-mounted charger, which can solve the problems of complex circuit and large occupied space in insulation detection of an alternating current side of a bidirectional vehicle-mounted charger in the prior art.
In order to solve the above-mentioned problems in the prior art, an embodiment of the present utility model provides an insulation detection circuit, including: the device comprises a first voltage division module, a second voltage division module, a bias module, a peak value sampling module and a controller; the first voltage dividing module is connected with the alternating current side of the vehicle-mounted charger and is used for collecting midpoint voltage of two poles of the alternating current side of the vehicle-mounted charger at a midpoint when the vehicle-mounted charger reversely outputs alternating current; the second voltage dividing module is connected with the first voltage dividing module and is used for dividing the midpoint voltage and outputting divided voltage; the resistance value of the resistor in the first voltage dividing module is smaller than that of the resistor in the second voltage dividing module; the bias module is connected to a bias power supply and is connected with the second voltage dividing module for providing bias voltage; the peak sampling module is connected with the bias module and is used for outputting peak voltage according to the bias voltage and the divided voltage; the controller is connected with the peak sampling module and is used for determining an insulation result of the vehicle-mounted charger according to the peak voltage.
In some embodiments, the first voltage dividing module comprises: a first resistor R1 and a second resistor R2; the first end of the first resistor R1 is connected with a live wire of alternating current reversely output by the vehicle-mounted charger, the first end of the second resistor R2 is connected with a zero line of alternating current reversely output by the vehicle-mounted charger, and the second end of the first resistor R1 and the second end of the second resistor R2 are connected with the second voltage dividing module.
In some embodiments, the second voltage dividing module comprises a plurality of resistors connected in series and each of the plurality of resistors is a mega ohm resistor.
In some embodiments, the bias module comprises: a resistor R4 and a resistor R5; the first end of the resistor R4 is connected to the bias power supply, the second end of the resistor R4 is connected with the second voltage dividing module, the peak sampling module and the first end of the resistor R5, the second end of the resistor R5 is grounded, the second end of the resistor R4 is connected to the voltage dividing voltage, and the bias power supply outputs bias voltage through the second end of the resistor R4.
In some embodiments, the peak sampling module comprises: an operational amplification unit and a filtering unit; the input end of the operational amplification unit is connected with the bias module, the output end of the operational amplification unit is connected with the input end of the filtering unit, and the output end of the filtering unit is connected with the controller; the operational amplification unit is used for outputting peak voltage according to the bias voltage and the divided voltage; the filtering unit is used for filtering the peak voltage.
In some embodiments, the operational amplification unit comprises: an amplifier U1 and a diode D1; the same-direction input end of the amplifier U1 is connected with the bias voltage and the divided voltage, the output end of the amplifier U1 is connected with the positive electrode of the diode D1, the negative electrode of the diode D1 is connected with the reverse input end of the amplifier U1, and the negative electrode of the diode D1 is also connected with the filtering unit.
In some embodiments, the filtering unit includes: resistor R6, resistor R7 and capacitor C1; the first end of the resistor R6 is connected with the operational amplification unit, the second end of the resistor R6 is connected with the first end of the resistor R7, the first end of the capacitor C1 and the controller, and the second end of the resistor R7 is connected with the second end of the capacitor C1 and grounded.
In some embodiments, the insulation detection circuit further comprises: the input end of the comparison module is connected with the peak value sampling module, and the output end of the comparison module is connected with the controller; the comparison module is used for comparing the peak voltage with a reference voltage and outputting a comparison voltage to the controller so that the controller can determine the insulation result of the vehicle-mounted charger according to the comparison voltage.
In order to solve the problems in the prior art, another embodiment of the present utility model provides a vehicle-mounted charger, wherein the vehicle-mounted charger is a bidirectional vehicle-mounted charger, and an ac side of the vehicle-mounted charger is provided with the insulation detection circuit as described above.
Unlike the prior art, the embodiment of the utility model provides an insulation detection circuit and a vehicle-mounted charger, wherein the insulation detection circuit comprises: the device comprises a first voltage division module, a second voltage division module, a bias module, a peak value sampling module and a controller; the first voltage dividing module is connected with the alternating current side of the vehicle-mounted charger and is used for collecting midpoint voltage of two poles of the alternating current side of the vehicle-mounted charger at a midpoint when the vehicle-mounted charger reversely outputs alternating current; the second voltage dividing module is connected with the first voltage dividing module and is used for dividing the midpoint voltage and outputting divided voltage; the resistance value of the resistor in the first voltage dividing module is smaller than that of the resistor in the second voltage dividing module; the bias module is connected to a bias power supply and is connected with the second voltage dividing module for providing bias voltage; the peak sampling module is connected with the bias module and is used for outputting peak voltage according to the bias voltage and the divided voltage; the controller is connected with the peak sampling module and is used for determining an insulation result of the vehicle-mounted charger according to the peak voltage. The insulation detection circuit provided by the embodiment of the utility model can perform insulation detection on the alternating current side of the bidirectional vehicle-mounted charger, and has the advantages of simpler circuit structure and smaller occupied space.
Drawings
FIG. 1 is a block diagram of an insulation detection circuit according to an embodiment of the present utility model;
fig. 2 is a schematic circuit diagram of an insulation detection circuit according to an embodiment of the present utility model;
fig. 3 is a schematic waveform diagram of voltage VL of the live wire to the ground wire and voltage VN of the neutral wire to the ground wire and voltage VA of point a in fig. 2 when the two poles of the ac side of the vehicle-mounted charger are insulated normally;
fig. 4 is a schematic waveform diagram of the voltage VA at the point a, the voltage VB at the point B, and the voltage VC at the point C in fig. 2 when the two poles of the ac side of the vehicle-mounted charger are insulated normally;
fig. 5 is a schematic waveform diagram of voltage VL of the live wire to the ground wire and voltage VN of the neutral wire to the ground wire and voltage VA of the point a in fig. 2 when insulation of the two poles of the ac side of the vehicle-mounted charger is abnormal;
fig. 6 is a schematic waveform diagram of the voltage VA at the point a, the voltage VB at the point B, and the voltage VC at the point C in fig. 2 when insulation of the two poles at the ac side of the vehicle-mounted charger is abnormal;
fig. 7 is a block diagram of another insulation detection circuit according to an embodiment of the present utility model.
Detailed Description
In order that the utility model may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.
The bidirectional vehicle-mounted charger outputs alternating current outwards in a discharging mode, namely in an inversion state. Since insulation impedances are respectively arranged between the live wire L and the neutral wire N of the alternating current output port and the ground wire PE of the shell, the insulation impedance of the live wire L and the ground wire PE is defined as Z1, and the insulation impedance of the neutral wire N and the ground wire PE is defined as Z2. As shown in fig. 2, since Y capacitors (not shown) exist between the live line L and the ground line PE and between the neutral line N and the ground line PE, the capacitance values of the Y capacitors are equal, so that the insulation impedances Z1 and Z2 each include the same capacitance impedance component, and in the case where insulation between the live line L and the ground line PE and between the neutral line N and the ground line PE is normal, the insulation impedances Z1 and Z2 are equal, the divided voltage amplitude of the ground line PE to the ac two poles is also equal, and the divided voltage phase dislocation phase is 180 °.
When insulation of the ac-side poles is abnormal, insulation impedances Z1 and Z2 are not equal, and the divided voltage amplitude of the ground line PE to the ac-side poles is not equal. Under the condition of normal insulation, the ideal value of the voltage at the point A is 0 after the voltage of the ground line PE is divided by the same resistor through the two poles at the alternating current side. When the insulation is abnormal, the voltage at the point a is not 0 after the voltage of the ground line PE is divided by the same resistor by the ac side poles. Based on the above, the embodiment of the utility model provides an insulation detection circuit, which can judge the insulation condition of the alternating-current two poles of the vehicle-mounted charger by sampling the voltage of the alternating-current two poles of the vehicle-mounted charger relative to the ground wire PE.
Referring to fig. 1, fig. 1 is a block diagram of an insulation detection circuit according to an embodiment of the utility model.
The insulation detection circuit 100 includes: a first voltage dividing module 10, a second voltage dividing module 20, a biasing module 30, a peak sampling module 40, and a controller 50.
The first voltage dividing module 10 is connected with the alternating current side of the vehicle-mounted charger and is used for collecting midpoint voltage of two poles of the alternating current side of the vehicle-mounted charger at the midpoint when the vehicle-mounted charger reversely outputs alternating current.
The second voltage dividing module 20 is connected to the first voltage dividing module 10 for dividing the midpoint voltage and outputting a divided voltage. The resistance of the resistor in the first voltage dividing module 10 is smaller than that of the resistor in the second voltage dividing module 20.
The bias module 30 is connected to a bias power source and the bias module 30 is connected to the second voltage dividing module 20 for providing a bias voltage.
The peak sampling module 40 is connected to the bias module 30 for outputting a peak voltage according to the bias voltage and the divided voltage.
The controller 50 is connected to the peak sampling module 40 for determining an insulation result of the vehicle-mounted charger according to the peak voltage. The insulation result comprises abnormal insulation of the alternating current side of the vehicle-mounted charger and normal insulation of the alternating current side of the vehicle-mounted charger.
Specifically, the two poles of the alternating current output by the vehicle-mounted charger are L, N, L also represents a live wire, N also represents a neutral wire, the voltages of the live wire L and the neutral wire N relative to the ground wire PE are respectively a voltage VL and a voltage VN, and after the voltage is divided by the first voltage dividing module 10, a midpoint voltage VA is obtained, and the midpoint voltage VA is still an alternating current voltage when insulation is abnormal. The midpoint voltage VA is divided by the second voltage dividing module 20 to obtain a divided voltage. While bias power supply VS2 outputs a bias voltage through bias module 30. The bias voltage adds the divided voltage such that the voltage input to the peak sampling module 40 is a positive voltage. The peak sampling module 40 samples the voltage peak value of the offset voltage superimposed divided voltage to obtain a peak voltage, and finally sends the peak voltage to the controller 50, and the controller 50 judges the insulation result of the ac side of the vehicle-mounted charger according to the peak voltage.
The controller 50 compares the voltage amplitude of the peak voltage with a preset threshold, which may be set arbitrarily as required, for example, may be set to 2V, 5V, 10V, etc. If the voltage amplitude of the peak voltage is larger than a preset threshold value, determining that the insulation of the alternating current side of the vehicle-mounted charger is abnormal. If the voltage amplitude of the peak voltage is smaller than or equal to a preset threshold value, the insulation of the alternating current side of the vehicle-mounted charger is determined to be normal.
The controller 50 is any one of a micro control unit, a digital signal processor, and a programmable gate array.
Referring to fig. 2, fig. 2 is a schematic circuit diagram of an insulation detection circuit according to an embodiment of the utility model.
In some embodiments, the first voltage dividing module 10 includes: a first resistor R1 and a second resistor R2.
Specifically, a first end of the first resistor R1 is connected with a live wire L of alternating current reversely output by the vehicle-mounted charger, a first end of the second resistor R2 is connected with a zero line N of alternating current reversely output by the vehicle-mounted charger, and a second end of the first resistor R1 and a second end of the second resistor R2 are both connected with the second voltage dividing module 20.
In some embodiments, the second voltage dividing module 20 includes a plurality of resistors connected in series and each of the plurality of resistors is a mega ohm resistor. In fig. 2, a plurality of megaohm resistors are connected in series by a resistor R3.
In general, since the insulation resistance and the insulation withstand voltage of the product are required between the live wire L or the neutral wire N and the ground wire PE, and the insulation resistance is usually required to be several tens of megaohms, and the insulation withstand voltage is usually up to 2kV to 4kV, the voltage dividing resistance between the live wire L or the neutral wire N and the ground wire PE needs to be several tens of megaohms to meet the withstand voltage requirement, and then the voltage dividing resistance needs to be formed by connecting a plurality of megaohms in series, if the live wire L and the neutral wire N are respectively connected with a plurality of megaohms in series, the number of resistance elements is large, and the space of the circuit board is occupied.
In this embodiment, as shown in fig. 2, the resistor R3 is formed by connecting a plurality of megaohm resistors in series, so as to meet the requirements of products on insulation resistance and insulation withstand voltage, the resistance values adopted by the resistor R1 and the resistor R2 are smaller, and the resistors R1 and R2 can also serve as safe discharge resistors of an alternating current side capacitor (not shown), so that the total number of resistor elements is smaller, the occupied space of a circuit board is smaller, and the cost is lower.
In some embodiments, the bias module 30 includes: resistor R4 and resistor R5.
Specifically, the first end of the resistor R4 is connected to the bias power source VS2, the second end of the resistor R4 is connected to the second voltage dividing module 20, the peak sampling module 40 and the first end of the resistor R5, the second end of the resistor R5 is grounded, the second end of the resistor R4 is connected to the voltage dividing voltage, and the bias power source outputs the bias voltage through the second end of the resistor R4.
In some embodiments, peak sampling module 40 includes: an operational amplification unit 401 and a filtering unit 402.
Specifically, an input end of the operational amplification unit 401 is connected to the bias module 30, an output end of the operational amplification unit 401 is connected to an input end of the filtering unit 402, and an output end of the filtering unit 402 is connected to the controller 50. The operational amplification unit 401 is configured to output a peak voltage according to the bias voltage and the divided voltage. The filtering unit 402 is used for filtering the peak voltage.
In some embodiments, the operational amplification unit 401 includes: an amplifier U1 and a diode D1.
Specifically, the same-directional input terminal of the amplifier U1 is connected to the bias voltage and the divided voltage, the output terminal of the amplifier U1 is connected to the positive electrode of the diode D1, the negative electrode of the diode D1 is connected to the reverse input terminal of the amplifier U1, and the negative electrode of the diode D1 is also connected to the filtering unit 402.
In some embodiments, the filtering unit 402 includes: resistor R6, resistor R7, and capacitor C1. Specifically, the first end of the resistor R6 is connected to the operational amplifying unit 401, the second end of the resistor R6 is connected to the first end of the resistor R7, the first end of the capacitor C1, and the controller 50, and the second end of the resistor R7 is connected to the second end of the capacitor C1 and grounded.
Specifically, as shown in fig. 2, the voltage VL and the voltage VN are divided by the resistors R1, R2, R3 and R4, the bias voltage V1 is generated by the bias power source VS2 at the point B by the resistors R4, R5, the divided voltage of the voltage VL and the voltage VN at the point a is denoted as the voltage VA, and the sum of the divided voltage of the voltage VA passing through the resistor R3 and the voltage of the bias voltage V1 at the point B is denoted as the voltage VB.
Under the condition that the two poles of the alternating current side of the vehicle-mounted charger are insulated normally, the voltage VB is equal to the point voltage bias voltage V1.
In the case of an insulation abnormality of the ac-side poles, the voltage VB is not equal to the bias voltage V1. Instead, the voltage VB is a sine wave voltage having the bias voltage V1 as a center value, and the voltage amplitude of the voltage VB is larger as the difference in insulation resistance of the two poles on the ac side is larger. The voltage VB outputs a peak voltage VC after passing through the peak sampling module 40, the peak voltage VC is sent to the controller 50, and the voltage amplitude of the peak voltage VC is compared with a preset threshold value by the controller 50, so that the insulation result of the alternating current side of the vehicle-mounted charger is judged.
Referring to fig. 3 and fig. 4 together, fig. 3 is a schematic waveform diagram of the voltage VL of the live wire to the ground wire, the voltage VN of the neutral wire to the ground wire, and the voltage VA of the point a in fig. 2 when the two poles of the ac side of the vehicle-mounted charger are insulated normally. Fig. 4 is a schematic waveform diagram of the voltage VA at the point a, the voltage VB at the point B, and the voltage VC at the point C in fig. 2 when the two poles of the ac side of the vehicle-mounted charger are insulated normally.
As shown in fig. 3, when the ac side poles of the vehicle-mounted battery charger are insulated normally, the voltage VL is close to the voltage VN in amplitude, the phase difference is close to 180 °, the voltage VA at the point a is close to a straight line, and the intermediate value of the voltage amplitude of the voltage VA is 0.
As shown in fig. 4, at this time, the voltage VB at point B is also close to a straight line, and the voltage VC at point C is the peak voltage of the voltage VB.
Referring to fig. 5 and 6 together, fig. 5 is a schematic waveform diagram of the voltage VL of the live wire to the ground wire, the voltage VN of the neutral wire to the ground wire, and the voltage VA of the point a in fig. 2 when the insulation of the two poles of the ac side of the vehicle-mounted charger is abnormal. Fig. 6 is a schematic waveform diagram of the voltage VA at the point a, the voltage VB at the point B, and the voltage VC at the point C in fig. 2 when insulation of the two poles at the ac side of the vehicle-mounted battery charger is abnormal.
As shown in fig. 5, when insulation of the ac side poles is abnormal, the amplitude of the voltage VL and the voltage VN are greatly different, the phase difference is not 180 °, the voltage VA at the point a is a sine wave voltage, and the amplitude is determined by the insulation.
As shown in fig. 6, at this time, the point B voltage VB is also sinusoidal, the amplitude is also determined by the insulation condition, the intermediate value of the voltage amplitude of the voltage VB is still V1, and the point C voltage VC is the peak voltage of the point B voltage.
Referring to fig. 7, fig. 7 is a block diagram illustrating another insulation detection circuit according to an embodiment of the present utility model.
In some embodiments, the insulation detection circuit 100 further comprises: the input end of the comparison module 60 is connected with the peak sampling module 40, and the output end of the comparison module 60 is connected with the controller 50.
Specifically, the comparing module 60 is configured to compare the peak voltage with a reference voltage, and output a comparison voltage to the controller 50, so that the controller 50 determines an insulation result of the vehicle-mounted charger according to the comparison voltage.
The comparison module 60 may be configured as a circuit with a comparator as a core element.
The embodiment of the utility model provides an insulation detection circuit 100, wherein the insulation detection circuit 100 comprises: a first voltage dividing module 10, a second voltage dividing module 20, a biasing module 30, a peak sampling module 40, and a controller 50. The first voltage dividing module 10 is connected with the alternating current side of the vehicle-mounted charger and is used for collecting midpoint voltage of two poles of the alternating current side of the vehicle-mounted charger at the midpoint when the vehicle-mounted charger reversely outputs alternating current. The second voltage dividing module 20 is connected to the first voltage dividing module 10 for dividing the midpoint voltage and outputting a divided voltage. The resistance of the resistor in the first voltage dividing module 10 is smaller than that of the resistor in the second voltage dividing module 20. The bias module 30 is connected to a bias power source and the bias module 30 is connected to the second voltage dividing module 20 for providing a bias voltage. The peak sampling module 40 is connected to the bias module 30 for outputting a peak voltage according to the bias voltage and the divided voltage. The controller 50 is connected to the peak sampling module 40 for determining an insulation result of the vehicle-mounted charger according to the peak voltage. The insulation detection circuit 100 provided by the embodiment of the utility model can perform insulation detection on the alternating current side of the bidirectional vehicle-mounted charger, and has a simpler circuit structure and smaller occupied space.
The embodiment of the utility model also provides a vehicle-mounted charger which is a bidirectional vehicle-mounted charger, and the alternating current side of the vehicle-mounted charger is provided with the insulation detection circuit 100. Please refer to the above detailed description of the insulation detection circuit 100, which is not described herein.
It should be noted that the description of the present utility model and the accompanying drawings illustrate preferred embodiments of the present utility model, but the present utility model may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, which are not to be construed as additional limitations of the utility model, but are provided for a more thorough understanding of the present utility model. The above-described features are further combined with each other to form various embodiments not listed above, and are considered to be the scope of the present utility model described in the specification; further, modifications and variations of the present utility model may be apparent to those skilled in the art in light of the foregoing teachings, and all such modifications and variations are intended to be included within the scope of this utility model as defined in the appended claims.
Claims (9)
1. An insulation detection circuit, characterized in that the insulation detection circuit comprises:
the device comprises a first voltage division module, a second voltage division module, a bias module, a peak value sampling module and a controller;
the first voltage dividing module is connected with the alternating current side of the vehicle-mounted charger and is used for collecting midpoint voltage of two poles of the alternating current side of the vehicle-mounted charger at a midpoint when the vehicle-mounted charger reversely outputs alternating current;
the second voltage dividing module is connected with the first voltage dividing module and is used for dividing the midpoint voltage and outputting divided voltage; the resistance value of the resistor in the first voltage dividing module is smaller than that of the resistor in the second voltage dividing module;
the bias module is connected to a bias power supply and is connected with the second voltage dividing module for providing bias voltage;
the peak sampling module is connected with the bias module and is used for outputting peak voltage according to the bias voltage and the divided voltage;
the controller is connected with the peak sampling module and is used for determining an insulation result of the vehicle-mounted charger according to the peak voltage.
2. The insulation detection circuit of claim 1, wherein the first voltage dividing module comprises:
a first resistor R1 and a second resistor R2;
the first end of the first resistor R1 is connected with a live wire of alternating current reversely output by the vehicle-mounted charger, the first end of the second resistor R2 is connected with a zero line of alternating current reversely output by the vehicle-mounted charger, and the second end of the first resistor R1 and the second end of the second resistor R2 are connected with the second voltage dividing module.
3. The insulation detection circuit of claim 2, wherein the second voltage dividing module comprises a plurality of resistors, the plurality of resistors being connected in series and each of the plurality of resistors being a mega ohm resistor.
4. An insulation detection circuit according to any of claims 1-3, wherein the bias module comprises:
a resistor R4 and a resistor R5;
the first end of the resistor R4 is connected to the bias power supply, the second end of the resistor R4 is connected with the second voltage dividing module, the peak sampling module and the first end of the resistor R5, the second end of the resistor R5 is grounded, the second end of the resistor R4 is connected to the voltage dividing voltage, and the bias power supply outputs bias voltage through the second end of the resistor R4.
5. The insulation detection circuit of claim 4, wherein the peak sampling module comprises:
an operational amplification unit and a filtering unit;
the input end of the operational amplification unit is connected with the bias module, the output end of the operational amplification unit is connected with the input end of the filtering unit, and the output end of the filtering unit is connected with the controller;
the operational amplification unit is used for outputting peak voltage according to the bias voltage and the divided voltage;
the filtering unit is used for filtering the peak voltage.
6. The insulation detection circuit according to claim 5, wherein the operational amplification unit includes:
an amplifier U1 and a diode D1;
the same-direction input end of the amplifier U1 is connected with the bias voltage and the divided voltage, the output end of the amplifier U1 is connected with the positive electrode of the diode D1, the negative electrode of the diode D1 is connected with the reverse input end of the amplifier U1, and the negative electrode of the diode D1 is also connected with the filtering unit.
7. The insulation detection circuit according to claim 6, wherein the filtering unit includes:
resistor R6, resistor R7 and capacitor C1;
the first end of the resistor R6 is connected with the operational amplification unit, the second end of the resistor R6 is connected with the first end of the resistor R7, the first end of the capacitor C1 and the controller, and the second end of the resistor R7 is connected with the second end of the capacitor C1 and grounded.
8. The insulation detection circuit of claim 7, further comprising:
the input end of the comparison module is connected with the peak value sampling module, and the output end of the comparison module is connected with the controller;
the comparison module is used for comparing the peak voltage with a reference voltage and outputting a comparison voltage to the controller so that the controller can determine the insulation result of the vehicle-mounted charger according to the comparison voltage.
9. A vehicle-mounted charger, characterized in that the vehicle-mounted charger is a bidirectional vehicle-mounted charger, and an ac side of the vehicle-mounted charger is provided with the insulation detection circuit according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223482457.XU CN219417644U (en) | 2022-12-22 | 2022-12-22 | Insulation detection circuit and vehicle-mounted charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223482457.XU CN219417644U (en) | 2022-12-22 | 2022-12-22 | Insulation detection circuit and vehicle-mounted charger |
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| Publication Number | Publication Date |
|---|---|
| CN219417644U true CN219417644U (en) | 2023-07-25 |
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| CN202223482457.XU Active CN219417644U (en) | 2022-12-22 | 2022-12-22 | Insulation detection circuit and vehicle-mounted charger |
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| CN (1) | CN219417644U (en) |
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2022
- 2022-12-22 CN CN202223482457.XU patent/CN219417644U/en active Active
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