Isolated power supply, compressor, electrical equipment and vehicle

Abstract

The utility model discloses an isolation power supply, compressor, electrical equipment and vehicle, the power supply includes: input power supply module, transformer and rectification output module, the primary winding of transformer is connected with input power supply module, the secondary winding of transformer is connected with rectification output module, the rectification output module comprises a first diode, a first capacitor, a second capacitor, a second diode, a third capacitor and a third diode, an anode of the first diode is connected with a first end of the secondary winding, and a cathode of the first diode is connected with a positive voltage output end, used for outputting positive voltage, of the isolation power supply; one end of the first capacitor is connected with the cathode of the first diode, and one end of the second capacitor, the other end of the first capacitor and the second end of the secondary winding are respectively connected with a reference voltage output end, used for outputting reference voltage, of the isolation power supply. According to the power supply, negative voltage output can be realized on the premise of not changing a transformer circuit, the circuit topology is simple, and the application cost and the design difficulty are greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, and in particular to an isolated power supply, a compressor, an electrical equipment and a vehicle. Background Art

[0002] In the compressor circuit system where the driving voltage is generated by an isolated switching power supply, a negative voltage is provided by adding a secondary winding of an isolation transformer to meet the negative voltage requirement of the driving voltage. However, this technical solution will increase the size and cost of the transformer, especially for a driving voltage output system with multiple negative voltages, which requires adding more secondary windings, greatly increasing the design difficulty. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art to at least a certain extent. To this end, the first purpose of the utility model is to provide an isolated power supply, which can achieve negative voltage output without changing the transformer circuit, and the circuit topology is simple, which greatly reduces the application cost and design difficulty.

[0004] The second objective of the present invention is to provide a compressor.

[0005] The third objective of the present invention is to provide an electrical device.

[0006] A fourth objective of the present invention is to provide a vehicle.

[0007] To achieve the above-mentioned purpose, the first aspect of the utility model proposes an isolated power supply, comprising: an input power module, a transformer and a rectifier output module, the primary winding of the transformer is connected to the input power module, the secondary winding of the transformer is connected to the rectifier output module, and the rectifier output module comprises: a first diode, the anode of the first diode is connected to the first end of the secondary winding, and the cathode of the first diode is connected to the positive voltage output end of the isolated power supply for outputting a positive voltage; a first capacitor, one end of the first capacitor is connected to the cathode of the first diode; a second capacitor, one end of the second capacitor, the other end of the first capacitor and the second end of the secondary winding are respectively connected to the reference voltage output end of the isolated power supply for outputting a reference voltage; a second diode, the anode of the second diode and the other end of the second capacitor are respectively connected to the negative voltage output end of the isolated power supply for outputting a negative voltage; a third capacitor, one end of the third capacitor is connected to the first end of the secondary winding, and the other end of the third capacitor is connected to the cathode of the second diode; a third diode, the anode of the third diode is connected to the other end of the third capacitor, and the cathode of the third diode is connected to the second end of the secondary winding.

[0008] According to the isolated power supply of the utility model, the primary winding of the transformer is connected to the input power module, the secondary winding of the transformer is connected to the rectifier output module, in the rectifier output module, the anode of the first diode is connected to the first end of the secondary winding, the cathode of the first diode is connected to the positive voltage output end of the isolated power supply for outputting positive voltage, one end of the first capacitor is connected to the cathode of the first diode, one end of the second capacitor, the other end of the first capacitor and the second end of the secondary winding are respectively connected to the reference voltage output end of the isolated power supply for outputting reference voltage, the anode of the second diode and the other end of the second capacitor are respectively connected to the negative voltage output end of the isolated power supply for outputting negative voltage, one end of the third capacitor is connected to the first end of the secondary winding, the other end of the third capacitor is connected to the cathode of the second diode, the anode of the third diode is connected to the other end of the third capacitor, and the cathode of the third diode is connected to the second end of the secondary winding. The isolated power supply can achieve negative voltage output without changing the transformer circuit, and the circuit topology is simple, which greatly reduces the application cost and design difficulty.

[0009] In addition, the isolated power supply according to the above embodiment of the utility model may also have the following additional technical features:

[0010] Furthermore, the isolated power supply also includes: an amplitude adjustment module, which is connected to the rectification output module and is configured to adjust the amplitude of the negative voltage.

[0011] Specifically, the amplitude adjustment module includes: a first resistor, one end of the first resistor is connected to the cathode of the second diode, and the other end of the first resistor is connected to the other end of the third capacitor.

[0012] Furthermore, the isolated power supply further includes: a voltage regulator diode, an anode of the voltage regulator diode is connected to the negative voltage output terminal, and a cathode of the voltage regulator diode is connected to the reference voltage output terminal.

[0013] Furthermore, the isolated power supply also includes: a negative voltage regulated power supply, which is connected to the negative voltage output terminal and is configured to regulate and output the negative voltage.

[0014] Specifically, the input power supply module includes: a first switch, a first end of the first switch is connected to the second end of the primary winding, and the second end of the first switch is grounded, wherein the first end of the primary winding is suitable for being connected to a power supply; a control module, a power supply end of the control module is connected to the power supply, a control end of the control module is connected to the third end of the first switch, and is configured to control the first switch.

[0015] Furthermore, the isolated power supply also includes: an output feedback module, which is respectively connected to the first feedback end of the rectifier output module and the control module, and is configured to sample the negative voltage and / or the positive voltage so that the control module controls the first switch based on the sampled voltage.

[0016] Furthermore, the isolated power supply also includes: an input feedback module, which is connected to the second end of the primary winding and the second feedback end of the control module and is configured to sample the primary winding so that the control module controls the first switch based on the sampled voltage.

[0017] To achieve the above-mentioned object, a second aspect of the utility model provides a compressor, comprising the above-mentioned isolated power supply.

[0018] According to the compressor of the utility model, based on the above-mentioned isolated power supply, negative voltage output can be achieved without changing the transformer circuit to meet the compressor driving requirements, and the circuit topology is simple, which greatly reduces the application cost and design difficulty.

[0019] To achieve the above-mentioned purpose, the third aspect of the utility model provides an electrical device, including the above-mentioned isolated power supply, or the above-mentioned compressor.

[0020] According to the electrical equipment of the utility model, based on the above-mentioned isolated power supply or the above-mentioned compressor, the negative pressure requirement of the driving voltage can be met without changing the transformer circuit, and the circuit topology is simple, which greatly reduces the application cost and design difficulty.

[0021] In order to achieve the above-mentioned purpose, the fourth aspect of the utility model proposes a vehicle, including the above-mentioned isolated power supply, or the above-mentioned compressor.

[0022] According to the vehicle of the utility model, based on the above-mentioned isolated power supply or the above-mentioned compressor, the negative pressure requirement of the driving voltage can be met without changing the transformer circuit, and the circuit topology is simple, which greatly reduces the application cost of the vehicle and the difficulty of circuit design.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of isolated power supply in related technology Figure 1 ;

[0025] Figure 2 Schematic diagram of isolated power supply in related technology Figure 2 ;

[0026] Figure 3Schematic diagram of isolated power supply in related technology Figure 3 ;

[0027] Figure 4 Schematic diagram of isolated power supply in related technology Figure 4 ;

[0028] Figure 5 is a circuit diagram of an isolated power supply according to an embodiment of the utility model;

[0029] Figure 6 for Figure 5 The current flow direction Figure 1 ;

[0030] Figure 7 for Figure 5 The current flow direction Figure 2 ;

[0031] Figure 8 A circuit of an isolated power supply according to a specific embodiment of the utility model Figure 1 ;

[0032] Fig. 9 A circuit of an isolated power supply according to a specific embodiment of the utility model Figure 2 ;

[0033] Fig.10 A circuit of an isolated power supply according to a specific embodiment of the utility model Figure 3 ;

[0034] Fig.11 A circuit of an isolated power supply according to a specific embodiment of the utility model Figure 4 ;

[0035] Fig.12 for Fig.11 The current flow direction Figure 1 ;

[0036] Fig.13 for Fig.11 The current flow direction Figure 2 ;

[0037] Fig.14 A circuit of an isolated power supply according to a specific embodiment of the utility model Figure 5 ;

[0038] Fig.15 It is a block diagram of a compressor according to a specific embodiment of the utility model;

[0039] Fig.16 A schematic diagram of an electrical device according to an embodiment of the present invention Figure 1 ;

[0040] Fig.17 A schematic diagram of an electrical device according to an embodiment of the present invention Figure 2 ;

[0041] Fig.18 A schematic diagram of a vehicle according to an embodiment of the present invention Figure 1 ;

[0042] Fig.19 A schematic diagram of a vehicle according to an embodiment of the present invention Figure 2 . DETAILED DESCRIPTION

[0043] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0044] The isolated power supply, compressor, electrical equipment and vehicle proposed by the present invention are described below with reference to the accompanying drawings.

[0045] Taking the automotive technology field as an example, the compressor of a car contains both high voltage (i.e., the high voltage battery of the whole vehicle) and low voltage (i.e., the low voltage battery of the whole vehicle) inputs. To facilitate motor control, the main controller and the drive circuit are usually located in the high voltage circuit area. To reduce power supply costs and ensure communication when the whole vehicle is not at high voltage, the power supply for the main controller and the drive circuit is usually derived from the low voltage battery voltage. The high and low voltage circuits do not share a common ground and need to be isolated, so the power is taken from the low voltage power supply through an isolated switching power supply. Due to the low load power and miniaturization requirements of the circuit, the isolated switching power supply usually adopts the flyback switching power supply topology.

[0046] A common power topology for automotive compressor controllers is Figure 1 As shown, the low-voltage power supply voltage VBAT is input, and VSUP is output through the filter circuit as the input of the isolated switch power supply. The isolated switch power supply has two outputs, VCC and VDD. VCC is directly or indirectly (a level of voltage regulator can be added in the middle) used as the power supply input of the three-phase motor drive circuit, and VDD is directly or indirectly (a level of voltage regulator can be added in the middle) used as the power supply input of the main controller and its peripheral circuits. For the three-phase inverter circuit, the reference ground potentials of the upper and lower bridge arm power switches are different, and VCC needs to provide the driving voltage for the upper bridge arm switch tube through three bootstrap circuits.

[0047] When the circuit is not convenient for bootstrap power supply, the isolated switching power supply needs to output three additional isolated voltages, so the transformer needs at least 5 pairs of windings, such as Figure 2As shown, VCC_U, VCC_V, and VCC_W are directly or indirectly used as the power supply input of the driving circuit of the three-phase upper bridge arm.

[0048] In the case where the drive circuit needs to add a negative voltage shutdown function, the negative voltage shutdown can improve the shutdown reliability. Negative voltage shutdown is especially commonly used in the drive of silicon carbide power devices. For systems with bootstrap circuits, since negative voltage cannot be bootstrapped under conventional circuits, only negative voltage shutdown of the lower bridge arm power device can be achieved. At this time, the isolated switch power supply needs to output an additional negative voltage. Usually, the transformer winding can be made into a center-tapped winding, in which the center tap end is used as the reference ground, and the other two ends of the winding output positive voltage and negative voltage respectively, such as Figure 3 As shown, VCC- is a negative voltage output relative to VCC, which can be used for negative voltage shutdown of the lower bridge arm power device.

[0049] For a power supply system without a bootstrap circuit, in order to achieve negative voltage shutdown, the four sets of output windings used by the isolated switching power supply for driving power supply need to be made into center-tapped windings, such as Figure 4 As shown, VCC- is a negative voltage output relative to VCC, which can be used for negative voltage shutdown of the lower bridge arm power device, and VCC_U-, VCC_V-, and VCC_W- are negative voltage outputs relative to VCC_U, VCC_V, and VCC_W, respectively, which can be used for negative voltage shutdown of the upper bridge arm power device.

[0050] In the above technical solution, adding a center tap of the winding will increase the number of transformer pins and process complexity, thereby increasing the size and cost of the transformer.

[0051] In order to solve the above technical problems, the present application proposes an isolated power supply, which can achieve negative voltage output without changing the original circuit of the transformer, that is, the layout of the primary winding and the secondary winding, and the circuit topology is simple, which greatly reduces the application cost and design difficulty.

[0052] The isolated power supply of the present application is described in detail below with reference to the accompanying drawings.

[0053] Figure 5 FIG. 4 is a circuit diagram of an isolated power supply according to an embodiment of the utility model.

[0054] like Figure 5 As shown, the isolated power supply 100 of the utility model includes: an input power module 10, a transformer 20 and a rectifier output module 30, the primary winding of the transformer 20 is connected to the input power module 10, and the secondary winding of the transformer 20 is connected to the rectifier output module 30.

[0055] The rectifier output module 30 includes: a first diode D1, an anode of the first diode D1 is connected to a first end of the secondary winding, and a cathode of the first diode D1 is connected to a positive voltage output end of the isolated power supply 100 for outputting a positive voltage VCC+; a first capacitor C1, one end of the first capacitor C1 is connected to the cathode of the first diode D1; a second capacitor C2, one end of the second capacitor C2, the other end of the first capacitor C1 and the second end of the secondary winding are respectively connected to a reference voltage output end of the isolated power supply 100 for outputting a reference voltage; a second diode D2, an anode of the second diode D2 and the other end of the second capacitor C2 are respectively connected to a negative voltage output end of the isolated power supply 100 for outputting a negative voltage VCC-; a ​​third capacitor C3, one end of the third capacitor C3 is connected to a first end of the secondary winding, and the other end of the third capacitor C3 is connected to the cathode of the second diode D2; a third diode D3, an anode of the third diode D3 is connected to the other end of the third capacitor C3, and the cathode of the third diode D3 is connected to the second end of the secondary winding.

[0056] Specifically, the reference voltage output by the isolation power supply 100 is used to distinguish between a positive voltage VCC+ and a negative voltage VCC-, wherein a voltage higher than the reference voltage is a positive voltage VCC+, and a voltage lower than the reference voltage is a negative voltage VCC-, which can be set by the user. Figure 5 In the illustrated embodiment, the reference voltage is 0V, and the reference voltage output terminal of the isolated power supply 100 is grounded.

[0057] The input power module 10 can inject direct current into the primary winding of the transformer 20. When the input power module 10 does not inject direct current into the primary winding of the transformer 20, the primary excitation of the transformer 20 is turned off, and the secondary circuit loop is as follows: Figure 6 As shown, the direct current outputted from the secondary winding charges the first capacitor C1 through the first diode D1 on the one hand, and charges the third capacitor C3 through the third diode D3 on the other hand.

[0058] When the input power module 10 injects direct current into the primary winding of the transformer 20, the direct current forms an excitation on the primary side of the transformer 20, and the circuit loop on the secondary side is as follows: Figure 7 As shown, the third capacitor C3 discharges and charges the second capacitor C2 through the second diode D2. When the input power module 10 is in a stable working state, the voltage across the second capacitor C2 is relatively stable, that is, a relatively stable negative voltage is formed between VCC- and GND.

[0059] In the isolated power supply, the first diode D1 is used to limit the current direction, the first capacitor C1 is used to store switching energy and stabilize the output voltage, the third capacitor C3 is used to store energy from the transformer 20 when the input power module 10 does not inject direct current into the primary winding of the transformer 20, and release energy when the input power module 10 injects direct current into the primary winding of the transformer 20, the second capacitor C2 is used to store switching energy and stabilize the output voltage, the second diode D2 is used to block the discharge and reverse charging of the second capacitor C2, and the third diode D3 is used to block the self-discharge of the third capacitor C3 or flow to the first capacitor C1. In the application process, the parameters of the first capacitor C1, the second capacitor C2, the third capacitor C3, the first diode D1, the second diode D2, and the third diode D3 can be selected according to the circuit output voltage and load size.

[0060] Furthermore, the secondary winding can be arranged on the secondary side or on the primary side, with the purpose of outputting the corresponding direct current based on the excitation voltage given to the primary winding by the input power module 10, and then outputting the stable positive voltage VCC+ and negative voltage VCC- based on the connected rectifier output module 30, and the specific position of the secondary winding is not limited. For example, taking the application of the isolated power supply to the automobile compressor system as an example, when the secondary winding is arranged on the primary side, the reference voltage output terminal of the isolated power supply 100 is connected to LVGND (low voltage ground terminal), and a stable negative voltage is generated between the negative voltage VCC- output by the rectifier output module 30 and LVGND, which can be used by the primary circuit system; when the secondary winding is arranged on the secondary side, the reference voltage output terminal of the isolated power supply 100 is connected to HVGND (high voltage ground terminal), and a stable negative voltage is generated between the negative voltage VCC- output by the rectifier output module 30 and HVGND, which can be used by the secondary circuit system.

[0061] In addition, for multi-channel drive output topology (such as Figure 2 As shown in the figure, it is only necessary to add a passive device, namely a rectifier output module 30, to each secondary winding that needs to generate negative voltage according to the above method to achieve multi-channel drive negative voltage output. Therefore, the present application can effectively solve the problem that the drive output negative voltage will increase the complexity of transformer design. Only by adding a few passive devices can a relatively stable negative voltage output be achieved. The circuit is relatively simple and the cost is low.

[0062] The following takes the secondary winding being arranged on the secondary side of the transformer 20 as an example to describe in detail the isolated power supply 100 of the present application.

[0063] Combination Figure 8As shown, in one embodiment of the present application, the isolated power supply 100 also includes: an amplitude adjustment module 40, which is connected to the rectifier output module 30 and is configured to adjust the amplitude of the negative voltage VCC-, thereby achieving adjustable negative voltage to meet different application scenarios.

[0064] The amplitude adjustment module 40 can be configured with parameters based on applicable scenarios before leaving the factory to complete the amplitude adjustment of the negative voltage VCC- in advance, that is, it is in the fixed parameter mode after leaving the factory; the amplitude adjustment module 40 can also be set to an adjustable mode after leaving the factory, so that the user can adjust the parameters based on the actual situation, which is not limited here. For example, the amplitude adjustment module 40 is composed of multiple resistors in parallel, and the charging current of the second capacitor C2 is adjusted by adjusting the number of parallel resistors, thereby achieving the amplitude adjustment of the negative voltage VCC-.

[0065] In one embodiment of the present application, the amplitude adjustment module 40 includes: a first resistor R1, one end of the first resistor R1 is connected to the cathode of the second diode D2, and the other end of the first resistor R1 is connected to the other end of the third capacitor C3. The first resistor R1 is used to limit the charging current of the second capacitor C2, thereby adjusting the negative voltage output range.

[0066] Specifically, the larger the resistance of the first resistor R1 is, the smaller the absolute value of the voltage across the second capacitor C2, ie, the negative voltage, is. Thus, a suitable negative voltage can be obtained by appropriately adjusting the resistance of R1.

[0067] Combination Fig. 9 As shown, in one embodiment of the present application, the isolated power supply 100 further includes: a voltage stabilizing diode ZD1, wherein the anode of the voltage stabilizing diode ZD1 is connected to the negative voltage output terminal, and the cathode of the voltage stabilizing diode ZD1 is connected to the reference voltage output terminal. Thus, the negative voltage outputted by the voltage stabilizing diode ZD1 can prevent the output voltage amplitude from being too large.

[0068] Combination Fig.10 As shown, in one embodiment of the present application, the isolated power supply 100 further includes: a negative voltage regulated power supply 50, which is connected to the negative voltage output terminal and is configured to regulate and output the negative voltage VCC-.

[0069] That is to say, in addition to the above-mentioned setting method of the voltage stabilizing diode ZD1, the negative voltage VCC- can also be stabilized by the negative voltage stabilizing power supply 50 to avoid excessive output voltage amplitude. Among them, the negative voltage stabilizing power supply 50 can be selected and applied based on actual conditions. For example, the negative voltage stabilizing power supply 50 uses a voltage stabilizer based on a feedback circuit, compares the difference between the output voltage and the reference voltage and feeds it back to the control circuit, and adjusts the output current to maintain the output voltage constant.

[0070] Combination Fig.11 As shown, in one embodiment of the present application, the input power module 10 includes: a first switch Q1, a first end of the first switch Q1 is connected to the second end of the primary winding, and the second end of the first switch Q1 is grounded, wherein the first end of the primary winding is suitable for being connected to the power supply VSUP; a control module 11, a power supply end of the control module 11 is connected to the power supply VSUP, and a control end of the control module 11 is connected to the third end of the first switch Q1, and is configured to control the first switch Q1.

[0071] Specifically, the output power is adjusted by controlling the on-off of the first switch Q1.

[0072] When the control module 11 controls the first switch Q1 to turn off, the power supply VSUP is turned off at the primary side of the transformer, that is, no DC power is injected into the primary winding. Fig.12 As shown, the direct current outputted by the secondary winding charges the first capacitor C1 through the diode D1 on the one hand, and charges the third capacitor C3 through the third diode D3 on the other hand.

[0073] When the control module 11 controls the first switch Q1 to be turned on, the power supply VSUP forms an excitation on the primary side of the transformer, that is, injects direct current into the primary winding. The secondary side circuit loop is as follows: Fig.13 As shown, the third capacitor C3 is discharged and charges the second capacitor C2 through the second diode D2 and the first resistor R1.

[0074] It should be noted that, in addition to the above configuration, the first switch Q1 may also be built into the control module 11 , and no specific requirement is imposed.

[0075] Furthermore, when the circuit design of the transformer 200 remains unchanged, an additional negative voltage is generated through the circuit design, which is equivalent to increasing the total load of the circuit. In order to ensure the stability of the negative voltage output and the reliability of the power supply load capacity, the negative voltage load needs to be controlled not to be too large, otherwise the output power of the isolated power supply needs to be increased, which can be achieved by adjusting the duty cycle of driving the first switch Q1.

[0076] Combination Fig.14 As shown, in one embodiment of the present application, the isolated power supply 100 also includes: an output feedback module 70, which is respectively connected to the rectifier output module 30 and the first feedback end of the control module 11, and is configured to sample the negative voltage VCC- and / or the positive voltage VCC+ so that the control module 11 controls the first switch Q1 based on the sampled voltage.

[0077] That is, the control module 11 adjusts the duty cycle of driving the first switch Q1 based on the output voltage to ensure the quality of the output voltage. The output feedback module 70 can sample the negative voltage VCC- or the positive voltage VCC+, or the negative voltage VCC- and the positive voltage VCC+. In addition, the output voltage can be sampled based on a voltage divider feedback circuit composed of resistors, which is not specifically limited.

[0078] In one embodiment of the present application, the isolated power supply 100 also includes: an input feedback module 60, which is connected to the second end of the primary winding and the second feedback end of the control module 11, and is configured to sample the primary winding so that the control module 11 controls the first switch Q1 based on the sampled voltage.

[0079] That is, the control module 11 adjusts the duty cycle of the first switch Q1 based on the input voltage of the primary winding to meet the output demand. The input feedback module 60 can sample the primary winding by connecting a resistor in series at the second end of the primary winding and sampling the voltage on the resistor, or can be directly connected to the second end of the primary winding to sample the voltage flowing through the primary winding, which is not limited here.

[0080] As a specific embodiment of the present application, Fig.14 As shown, the primary winding is arranged on the primary side, the secondary winding is arranged on the secondary side, the second end of the primary winding is connected to LVGND (low voltage ground terminal) through the first switch Q1, and the reference voltage output terminal of the rectifier output module 30 is connected to HVGND (high voltage ground terminal).

[0081] When the control module 11 controls the first switch Q1 to turn off, the power supply VSUP does not inject DC power into the primary winding, and the secondary current flows to Fig.12 As shown, the energy output by the secondary winding charges the first capacitor C1 through the diode D1 on the one hand, and charges the third capacitor C3 through the third diode D3 on the other hand.

[0082] When the control module 11 controls the first switch Q1 to be turned on, the power supply VSUP injects direct current into the primary winding, and the current on the secondary side flows to Fig.13 As shown, the third capacitor C3 is discharged and charges the second capacitor C2 through the second diode D2 and the first resistor R1.

[0083] In the process of driving the first switch Q1, the isolated power supply 100 samples the negative voltage VCC- through the output feedback module 70, samples the voltage at the second end of the primary winding through the input feedback module 60, and adjusts the duty cycle of the first switch Q1 based on the sampled voltage. At the same time, the resistance value of the first resistor R1 can be set based on actual needs to adjust the amplitude range of the negative voltage VCC-.

[0084] The present application proposes an isolated power supply with simple topology, stability and reliability, adjustable negative voltage output, and no need to change the transformer design, which can better solve the technical problems existing in the related technology.

[0085] In summary, according to the isolated power supply of the utility model, the primary winding of the transformer is connected to the input power module, the secondary winding of the transformer is connected to the rectifier output module, in the rectifier output module, the anode of the first diode is connected to the first end of the secondary winding, the cathode of the first diode is connected to the positive voltage output end of the isolated power supply for outputting a positive voltage, one end of the first capacitor is connected to the cathode of the first diode, one end of the second capacitor, the other end of the first capacitor and the second end of the secondary winding are respectively connected to the reference voltage output end of the isolated power supply for outputting a reference voltage, the anode of the second diode and the other end of the second capacitor are respectively connected to the negative voltage output end of the isolated power supply for outputting a negative voltage, one end of the third capacitor is connected to the first end of the secondary winding, the other end of the third capacitor is connected to the cathode of the second diode, the anode of the third diode is connected to the other end of the third capacitor, and the cathode of the third diode is connected to the second end of the secondary winding. The isolated power supply can achieve negative voltage output without changing the transformer circuit, and the circuit topology is simple, which greatly reduces the application cost and design difficulty.

[0086] Corresponding to the above embodiment, the utility model also proposes a compressor.

[0087] like Fig.15 As shown, the compressor 200 of the present invention includes the above-mentioned isolation power supply 100.

[0088] According to the compressor of the utility model, based on the above-mentioned isolated power supply, negative voltage output can be achieved without changing the transformer circuit to meet the compressor driving requirements, and the circuit topology is simple, which greatly reduces the application cost and design difficulty.

[0089] Corresponding to the above embodiment, the present utility model further proposes an electrical device 1000 .

[0090] like Fig.16 As shown, the electrical device 1000 of the utility model includes the above-mentioned isolated power supply 100, or as Fig.17As shown, the electrical device 1000 includes the above-mentioned compressor 200. The electrical device 1000 may be a power-consuming device that requires isolated power supply, such as a communication device. The electrical device 1000 may also be a device type driven by the compressor 200, and the compressor 200 is provided with a corresponding driving voltage through the isolated power supply 100, such as an air conditioner.

[0091] According to the electrical equipment of the utility model, based on the above-mentioned isolated power supply or the above-mentioned compressor, the negative pressure requirement of the driving voltage can be met without changing the transformer circuit, and the circuit topology is simple, which greatly reduces the application cost and design difficulty.

[0092] Corresponding to the above embodiments, the present application also proposes a vehicle.

[0093] like Fig.18 As shown, the vehicle 2000 of the present invention includes the above-mentioned isolated power supply 100, or as Fig.19 As shown, the vehicle 2000 includes the above-mentioned compressor 200. In the embodiment where the vehicle 2000 includes the isolated power supply 100, the isolated power supply 100 can be applied according to actual conditions, for example, it can be used in the vehicle's communication power supply system, compressor power supply system, etc., which is not limited here.

[0094] The vehicle 2000 according to the present practical embodiment includes the isolated power supply 100 or the compressor 200 described in any of the above embodiments. Here, the vehicle 2000 can be a new energy vehicle. In some embodiments, the new energy vehicle can be a pure electric vehicle with a motor as the main driving force. In other embodiments, the new energy vehicle can also be a hybrid vehicle with an internal combustion engine and a motor as the main driving force. Regarding the internal combustion engine and the motor mentioned in the above embodiments that provide driving power for the new energy vehicle, the internal combustion engine can use gasoline, diesel, hydrogen, etc. as fuel, and the way to provide electrical energy for the motor can use power batteries, hydrogen fuel cells, etc., which are not specifically limited here. It should be noted that this is only an exemplary description of the structure of new energy vehicles, etc., and it does not limit the scope of protection of the present utility model.

[0095] According to the vehicle of the utility model, based on the above-mentioned isolated power supply or the above-mentioned compressor, the negative pressure requirement of the driving voltage can be met without changing the transformer circuit, and the circuit topology is simple, which greatly reduces the application cost of the vehicle and the difficulty of circuit design.

[0096] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0097] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0098] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0099] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An isolated power supply, characterized in that: include: An input power module, a transformer and a rectifier output module, wherein the primary winding of the transformer is connected to the input power module, the secondary winding of the transformer is connected to the rectifier output module, and the rectifier output module comprises: a first diode, wherein an anode of the first diode is connected to a first end of the secondary winding, and a cathode of the first diode is connected to a positive voltage output terminal of the isolated power supply for outputting a positive voltage; a first capacitor, wherein one end of the first capacitor is connected to the cathode of the first diode; A second capacitor, one end of the second capacitor, the other end of the first capacitor and the second end of the secondary winding are respectively connected to a reference voltage output end of the isolated power supply for outputting a reference voltage; a second diode, an anode of the second diode and the other end of the second capacitor are respectively connected to a negative voltage output terminal of the isolation power supply for outputting a negative voltage; a third capacitor, one end of the third capacitor being connected to the first end of the secondary winding, and the other end of the third capacitor being connected to the cathode of the second diode; A third diode, wherein an anode of the third diode is connected to the other end of the third capacitor, and a cathode of the third diode is connected to the second end of the secondary winding.

2. The isolated power supply according to claim 1, characterized in that: The isolated power supply further includes: an amplitude adjustment module, which is connected to the rectification output module and is configured to adjust the amplitude of the negative voltage.

3. The isolated power supply according to claim 2, characterized in that: The amplitude adjustment module includes: a first resistor, one end of the first resistor is connected to the cathode of the second diode, and the other end of the first resistor is connected to the other end of the third capacitor.

4. The isolated power supply according to claim 1, characterized in that: The isolated power supply further includes: a voltage stabilizing diode, an anode of the voltage stabilizing diode is connected to the negative voltage output terminal, and a cathode of the voltage stabilizing diode is connected to the reference voltage output terminal.

5. The isolated power supply according to claim 1, characterized in that: The isolated power supply further includes: a negative voltage regulated power supply, which is connected to the negative voltage output terminal and is configured to regulate and output the negative voltage.

6. The isolated power supply according to any one of claims 1 to 5, characterized in that: The input power module comprises: a first switch, wherein a first end of the first switch is connected to a second end of the primary winding, and the second end of the first switch is grounded, wherein the first end of the primary winding is suitable for being connected to a power supply; A control module, wherein a power supply end of the control module is connected to the power supply, and a control end of the control module is connected to a third end of the first switch, and is configured to control the first switch.

7. The isolated power supply according to claim 6, characterized in that: The isolated power supply also includes: an output feedback module, which is connected to the first feedback end of the rectifier output module and the control module respectively, and is configured to sample the negative voltage and / or the positive voltage so that the control module controls the first switch based on the sampled voltage.

8. The isolated power supply according to claim 6, characterized in that: The isolated power supply further comprises: An input feedback module is connected to the second end of the primary winding and the second feedback end of the control module, and is configured to sample the primary winding so that the control module controls the first switch based on the sampled voltage.

9. A compressor, characterized in that: Comprising an isolated power supply according to any one of claims 1-8.

10. An electrical device, characterized in that: Comprising the isolated power supply according to any one of claims 1-8, or the compressor according to claim 9.

11. A vehicle, characterized in that: Comprising the isolated power supply according to any one of claims 1-8, or the compressor according to claim 9.

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