A novel auxiliary power supply circuit
Patent Information
- Application Number
- CN202522759872.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-26
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-12-26
AI Technical Summary
Existing auxiliary power supply circuits have many components and are costly, especially bridge rectifier circuits which require multiple rectifier diodes.
A novel auxiliary power supply circuit is adopted, including a first rectifier module, an input filter module, a single-stage converter, an output filter module, and a driving diode. By reducing the use of diodes, a simple power supply circuit is constructed.
It achieves a simple and low-cost auxiliary power supply, requiring only a small number of driving diodes to meet the power supply needs.
Smart Images
Figure CN224935567U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of auxiliary power supply, and more specifically, to a novel auxiliary power supply circuit. Background Technology
[0002] Figure 1 and Figure 2 The power supply circuit topologies of the auxiliary power supply in the prior art are shown respectively, wherein Figure 1 It adopts a two-stage circuit structure, and Figure 2 It adopts a single-level structure. Although Figure 2 The single-stage structure shown saves on the use of bus electrolytic capacitors and combines the PFC circuit and the isolation DC-DC circuit into one, saving on the number of components. However, it usually requires a bridge rectifier circuit for power output. A conventional bridge rectifier circuit uses six rectifier diodes to rectify the three-phase AC power into a pulsating DC voltage, which is then filtered by electrolytic capacitors to output a DC power with smaller pulsation to power the auxiliary power supply. Therefore, the power supply circuit still requires more components, resulting in a higher cost. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide a new type of auxiliary power supply circuit that, in view of the above-mentioned defects of the prior art, requires fewer diodes, has a simple circuit, and is therefore low in cost.
[0004] The technical solution adopted by this utility model to solve its technical problem is: to construct a novel auxiliary power supply circuit, including a first rectifier module, a first input filter module, a first single-stage converter, an output filter module, a first driving diode, and a second driving diode; The first input terminal and the second input terminal of the first rectifier module are connected to the power supply, and the first output terminal and the second output terminal are connected to the first input filter module. The first input filter module is connected to the first single-stage converter. The anode of the first driving diode is connected to the first output terminal of the first rectifier module, and the cathode is connected to the first terminal of the output filter module. The anode of the second driving diode is connected to the second output terminal of the first rectifier module, and the cathode is connected to the second terminal of the output filter module. The two ends of the output filter module are connected to an auxiliary power supply.
[0005] In the novel auxiliary power supply circuit of this utility model, the power supply includes a first power supply terminal and a second power supply terminal; the first input terminal of the first rectifier module is connected to the first power supply terminal, and the second input terminal of the first rectifier module is connected to the second power supply terminal.
[0006] The novel auxiliary power supply circuit of this utility model further includes a second rectifier module, a second input filter module, a second single-stage converter, a third driving diode, and a fourth driving diode. The first and second input terminals of the second rectifier module are connected to the power supply, and the first and second output terminals are connected to the second input filter module. The second input filter module is connected to the second single-stage converter. The anode of the third driving diode is connected to the first output terminal of the second rectifier module, and the cathode is connected to the first terminal of the output filter module. The anode of the fourth driving diode is connected to the second output terminal of the second rectifier module, and the cathode is connected to the second terminal of the output filter module. The two ends of the output filter module are connected to the auxiliary power supply.
[0007] In the novel auxiliary power supply circuit described in this utility model, the power supply includes a first power supply terminal and a second power supply terminal. The first input terminal of the first rectifier module and the first input terminal of the second rectifier module are connected to the first power supply terminal; The second input terminal of the first rectifier module and the second input terminal of the second rectifier module are connected to the second power supply terminal.
[0008] The novel auxiliary power supply circuit described in this utility model further includes a third rectifier module, a third input filter module, and a third single-stage converter; The first and second input terminals of the third rectifier module are connected to the power supply, and the first and second output terminals are connected to the third input filter module. The third input filter module is connected to the third single-stage converter.
[0009] In the novel auxiliary power supply circuit described in this utility model, the power supply includes a first power supply terminal, a second power supply terminal, and a third power supply terminal. The first input terminal of the first rectifier module is connected to the first power supply terminal, and the second input terminal is connected to the second power supply terminal. The first input terminal of the second rectifier module is connected to the first power supply terminal, and the second input terminal is connected to the third power supply terminal; The first input terminal of the third rectifier module is connected to the first power supply terminal, and the second input terminal is connected to the third power supply terminal.
[0010] In the novel auxiliary power supply circuit of this utility model, the output filtering module includes a first output filtering capacitor and a second output filtering capacitor. The positive terminal of the first output filter capacitor is connected to the cathode of the first driving diode and / or the cathode of the third driving diode; the negative terminal of the first output filter capacitor is connected to the positive terminal of the second output filter capacitor; the negative terminal of the second output filter capacitor is connected to the anode of the second driving diode and / or the anode of the fourth driving diode.
[0011] In the novel auxiliary power supply circuit of this utility model, the rectifier module includes a diode rectifier bridge; and / or the input filter module includes two filter capacitors connected in series.
[0012] In the novel auxiliary power supply circuit of this utility model, the single-stage converter includes a transformer, a DAB module connected to the primary winding of the transformer, and a secondary output module connected to the secondary winding of the transformer.
[0013] In the novel auxiliary power supply circuit described in this utility model, the DAB module includes a primary-side switching transistor unit, a DC blocking capacitor, and an energy storage inductor. The first input terminal of the primary-side switching transistor unit is connected to the first output terminal of the rectifier module, the second input terminal is connected to the second output terminal of the rectifier module, the first output terminal is connected to the first terminal of the primary winding of the transformer via the energy storage inductor, and the second output terminal is connected to the second terminal of the primary winding of the transformer via the energy storage inductor.
[0014] This utility model discloses an auxiliary power supply circuit, comprising a first rectifier module, a first input filter module, a first single-stage converter, an output filter module, a first driving diode, and a second driving diode. The first input and second input terminals of the first rectifier module are connected to a power supply, and its first and second output terminals are connected to the first input filter module. The first input filter module is connected to the first single-stage converter. The anode of the first driving diode is connected to the first output terminal of the first rectifier module, and its cathode is connected to the first terminal of the output filter module. The anode of the second driving diode is connected to the second output terminal of the first rectifier module, and its cathode is connected to the second terminal of the output filter module. The two ends of the output filter module are connected to an auxiliary power supply, thereby supplying power to the auxiliary power supply. Therefore, implementing this utility model's auxiliary power supply circuit requires only a small number of driving diodes to supply power to the auxiliary power supply, resulting in fewer diodes, a simpler circuit, and lower cost. Attached Figure Description
[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 The existing auxiliary power supply's two-stage power supply circuit topology; Figure 2 The existing auxiliary power supply uses a single-stage power supply circuit topology; Figure 3 This is a schematic block diagram of the first preferred embodiment of the novel auxiliary power supply circuit of this utility model; Figure 4 This is a schematic block diagram of the second preferred embodiment of the novel auxiliary power supply circuit of this utility model; Figure 5 This is a circuit diagram of the third preferred embodiment of the novel auxiliary power supply circuit of this utility model; Figure 6 yes Figure 5 The voltage waveforms shown are provided by the novel auxiliary power supply circuit and the existing bridge rectifier circuit, respectively. Detailed Implementation
[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0017] Figure 3 This is a schematic block diagram of the first preferred embodiment of the novel auxiliary power supply circuit of this utility model. (See diagram for example.) Figure 3 As shown, a novel auxiliary power supply circuit of this utility model includes a first rectifier module 110, a first input filter module 210, a first single-stage converter 310, an output filter module 400, a first driving diode 510, and a second driving diode 520. The first input terminal and the second input terminal of the first rectifier module 110 are connected to a power supply, and the first output terminal and the second output terminal are connected to the first input filter module 210. The first input filter module 210 is connected to the first single-stage converter 310. The anode of the first driving diode 510 is connected to the first output terminal of the first rectifier module 110, and the cathode is connected to the first terminal of the output filter module 400. The anode of the second driving diode 520 is connected to the second output terminal of the first rectifier module 110, and the cathode is connected to the second terminal of the output filter module 400. The two ends of the output filter module are connected to an auxiliary power supply, thereby supplying power to the auxiliary power supply.
[0018] exist Figure 3 In the preferred embodiment shown, the power supply includes a first power terminal and a second power terminal; the first input terminal of the first rectifier module 110 is connected to the first power terminal, and the second input terminal of the first rectifier module 110 is connected to the second power terminal. Figure 3 In the preferred embodiment shown, the first power supply terminal is the live wire terminal L, and the second power supply terminal is the neutral wire terminal N.
[0019] In a preferred embodiment of this utility model, the first rectifier module 110, the first input filter module 210, the first single-stage converter 310, and the output filter module 400 can be constructed using any known rectifier module, filter module, and single-stage converter in the art, all of which fall within the protection scope of this utility model.
[0020] In implementing the auxiliary power supply circuit of this utility model, the first driving diode 510 and the second driving diode 520 can be combined with the first rectifier module 110 to form a power supply circuit. Only two driving diodes are needed to supply power to the auxiliary power supply. Therefore, fewer diodes are required, the circuit is simple, and the cost is low.
[0021] Figure 4 This is a schematic block diagram of a second preferred embodiment of the novel auxiliary power supply circuit of this utility model. Figure 4 In the preferred embodiment shown, a novel auxiliary power supply circuit of this utility model includes a first rectifier module 110, a first input filter module 210, a first single-stage converter 310, an output filter module 400, a first driving diode 510, a second driving diode 520, a second rectifier module 120, a second input filter module 220, a second single-stage converter 320, a third driving diode 530, and a fourth driving diode 540; the power supply includes a first power supply terminal and a second power supply terminal. Figure 4 In the preferred embodiment shown, the first power supply terminal is the first live wire terminal L1, and the second power supply terminal is the second live wire terminal L2.
[0022] The first input terminal of the first rectifier module 110 and the first input terminal of the second rectifier module 120 are connected to the first power supply terminal. The second input terminals of the first rectifier module 110 and the second rectifier module 120 are connected to the second power supply terminal. The first output terminal and the second output terminal of the first rectifier module 110 are connected to the first input filter module 210, and the first input filter module 210 is connected to the first single-stage converter 310. The first output terminal and the second output terminal of the second rectifier module 120 are connected to the second input filter module 220, and the second input filter module 220 is connected to the second single-stage converter 320. The anode of the first driving diode 510 is connected to the first output terminal of the first rectifier module 110, and the cathode is connected to the first terminal of the output filter module 400. The anode of the second driving diode 520 is connected to the second output terminal of the first rectifier module 110, and the cathode is connected to the second terminal of the output filter module 400. The anode of the third driving diode 530 is connected to the first output terminal of the second rectifier module 120, and the cathode is connected to the first terminal of the output filter module 400. The anode of the fourth driving diode 540 is connected to the second output terminal of the second rectifier module 120, and the cathode is connected to the second terminal of the output filter module 400. The two ends of the output filter module are connected to an auxiliary power supply, thereby supplying power to the auxiliary power supply.
[0023] Similarly, in this preferred embodiment, the first driving diode 510 and the second driving diode 520 can be combined with the first rectifier module 110 (i.e., using the diode rectifier bridge of the rectifier module 110), and the third driving diode 530 and the fourth driving diode 540 can be combined with the second rectifier module 210 (i.e., using the diode rectifier bridge of the rectifier module 210) to form a power supply circuit.
[0024] In a further preferred embodiment of the present invention, a novel auxiliary power supply circuit includes a first rectifier module 110, a first input filter module 210, a first single-stage converter 310, an output filter module 400, a first driving diode 510, a second driving diode 520, a second rectifier module 120, a second input filter module 220, a second single-stage converter 320, a third driving diode 530, a fourth driving diode 540, a third rectifier module, a third input filter module, and a third single-stage converter; the power supply includes a first power supply terminal, a second power supply terminal, and a third power supply terminal. The first input terminal of the first rectifier module 110 is connected to the first power supply terminal, and the second input terminal is connected to the second power supply terminal. The first input terminal of the second rectifier module 120 is connected to the first power supply terminal, and the second input terminal is connected to the third power supply terminal. The first input terminal of the third rectifier module is connected to the first power supply terminal, and the second input terminal is connected to the third power supply terminal.
[0025] The first output terminal and the second output terminal of the first rectifier module 110 are connected to the first input filter module 210, and the first input filter module 210 is connected to the first single-stage converter 310. The first output terminal and the second output terminal of the second rectifier module 120 are connected to the second input filter module 220, and the second input filter module 220 is connected to the second single-stage converter 320. The first output terminal and the second output terminal of the third rectifier module are connected to the third input filter module, and the third input filter module is connected to the third single-stage converter. The anode of the first driving diode 510 is connected to the first output terminal of the first rectifier module 110, and the cathode is connected to the first terminal of the output filter module 400. The anode of the second driving diode 520 is connected to the second output terminal of the first rectifier module 110, and the cathode is connected to the second terminal of the output filter module 400. The anode of the third driving diode 530 is connected to the first output terminal of the second rectifier module 120, and the cathode is connected to the first terminal of the output filter module 400. The anode of the fourth driving diode 540 is connected to the second output terminal of the second rectifier module 120, and the cathode is connected to the second terminal of the output filter module 400. The two ends of the output filter module are connected to an auxiliary power supply, thereby supplying power to the auxiliary power supply.
[0026] The auxiliary power supply circuit of this utility model only requires four driving diodes to supply power to the auxiliary power source. Therefore, fewer diodes are needed, the circuit is simple, and the cost is low.
[0027] Figure 5 This is a circuit diagram of the third preferred embodiment of the novel auxiliary power supply circuit of this utility model; Figure 6 yes Figure 5 The voltage waveforms shown are those of the novel auxiliary power supply circuit and the existing bridge rectifier circuit. The following section combines... Figures 5-6 The preferred embodiment of the novel auxiliary power supply circuit of this utility model is described below.
[0028] This utility model discloses a novel auxiliary power supply circuit comprising a first rectifier module, a first input filter module, a first single-stage converter, an output filter module, a driver diode D15, a driver diode D14, a second rectifier module, a second input filter module, a second single-stage converter, a driver diode D16, a driver diode D13, a third rectifier module, a third input filter module, and a third single-stage converter.
[0029] exist Figure 5 In the preferred embodiment shown, the power supply is a three-phase power supply, therefore including a first power supply terminal, a second power supply terminal, and a third power supply terminal. The first, second, and third rectifier modules each include a diode rectifier bridge, namely diodes D1-D4, D5-D8, and D9-D12. The first, second, and third input filter modules each include series capacitors, namely capacitors C1-C2, C3-C4, and C14-C15.
[0030] The first, second, and third single-stage converters each include a transformer, a DAB (Dual Active Bridge) module connected to the primary winding of the transformer, and a secondary output module connected to the secondary winding of the transformer. The DAB module includes a primary-side switching transistor unit, a DC blocking capacitor, and an energy storage inductor. The first input terminal of the primary-side switching transistor unit is connected to the first output terminal of the rectifier module, the second input terminal is connected to the second output terminal of the rectifier module, the first output terminal is connected to the first end of the primary winding of the transformer via the energy storage inductor, and the second output terminal is connected to the second end of the primary winding of the transformer via the energy storage inductor.
[0031] exist Figure 5 In the preferred embodiment shown, the first single-stage converter includes a primary-side switching unit composed of FETD~FETD3, an energy storage inductor L1, a DC blocking capacitor C5, a transformer Tr2, and a secondary-side output module composed of FETD4~FETD6 and capacitors C6~C7. The second single-stage converter includes a primary-side switching unit composed of FETD16~FETD19, an energy storage inductor L3, a DC blocking capacitor C11, a transformer Tr4, and a secondary-side output module composed of FETD20~FETD23 and capacitors C12~C13. The third single-stage converter includes a primary-side switching unit composed of FETD24~FETD27, an energy storage inductor L4, a DC blocking capacitor C16, a transformer Tr5, and a secondary-side output module composed of FETD28~FETD31 and capacitors C17~C18. The output filter module 400 includes output filter capacitors C8 and C7.
[0032] The anode of the driving diode D15 is connected to the cathodes of diode D1 and D3; the anode of the driving diode D16 is connected to the cathodes of diode D9 and D11; the cathode of the driving diode D14 is connected to the anodes of diode D2 and D4; the cathode of the driving diode D13 is connected to the anodes of diode D10 and D12; the positive terminal of the output filter capacitor C8 is connected to the cathodes of the driving diode D15 and / or the driving diode D16; the negative terminal of the output filter capacitor C8 is connected to the positive terminal of the output filter capacitor C7; the negative terminal of the output filter capacitor C7 is connected to the anode of the driving diode D14 and / or the anode of the driving diode D13.
[0033] exist Figure 5 In the preferred embodiment shown, diodes D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, and D12 are the diodes of the main power rectifier section; capacitors C1, C2, C3, C4, C14, and C15 are the main power filter capacitors, with a capacitance of 2µF, used to filter out voltage glitches. The AC input is converted into a 100Hz peak wave with a peak value of 1.414. The minimum value of Vinrms is close to 0V (under load, i.e. when the main power circuit is working); such a large voltage fluctuation does not meet the auxiliary power supply requirements; therefore, driver diodes D13, D14, D15, and D16 are added, which serve as rectification and isolation; output filter capacitors C8 and C9, each 220uf, serve as energy storage and filtering capacitors.
[0034] The driving diodes D13, D14, D15, and D1 borrow diodes D1, D2, D3, D4, D9, D10, D11, and D12 from the main power circuit to jointly complete the rectification function of the input three-phase power, providing a relatively smooth input voltage for the auxiliary power supply. Figure 2 Compared with conventional bridge rectifier power supply methods, the novel auxiliary power supply circuit of this utility model saves at least two diodes. Figure 6 The power supply voltage waveforms for the two schemes show that the new auxiliary power supply circuit of this invention has a smoother waveform and smaller ripple, which is within 20V, thus meeting the auxiliary power supply requirements.
[0035] Although this utility model has been described through specific embodiments, those skilled in the art should understand that various modifications and equivalent substitutions can be made to this utility model without departing from its scope. Furthermore, various modifications can be made to this utility model for specific situations or materials without departing from its scope. Therefore, this utility model is not limited to the specific embodiments disclosed, but should include all embodiments falling within the scope of the claims of this utility model.
[0036] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A novel auxiliary power supply circuit, characterized in that, It includes a first rectifier module, a first input filter module, a first single-stage converter, an output filter module, a first driver diode, and a second driver diode; The first input terminal and the second input terminal of the first rectifier module are connected to the power supply, and the first output terminal and the second output terminal are connected to the first input filter module. The first input filter module is connected to the first single-stage converter. The anode of the first driving diode is connected to the first output terminal of the first rectifier module, and the cathode is connected to the first terminal of the output filter module. The anode of the second driving diode is connected to the second output terminal of the first rectifier module, and the cathode is connected to the second terminal of the output filter module. The two ends of the output filter module are connected to an auxiliary power supply.
2. The novel auxiliary power supply circuit according to claim 1, characterized in that, The power supply includes a first power terminal and a second power terminal; the first input terminal of the first rectifier module is connected to the first power terminal, and the second input terminal of the first rectifier module is connected to the second power terminal.
3. The novel auxiliary power supply circuit according to claim 1, characterized in that, It further includes a second rectifier module, a second input filter module, a second single-stage converter, a third driving diode, and a fourth driving diode; The first and second input terminals of the second rectifier module are connected to the power supply, and the first and second output terminals are connected to the second input filter module. The second input filter module is connected to the second single-stage converter. The anode of the third driving diode is connected to the first output terminal of the second rectifier module, and the cathode is connected to the first terminal of the output filter module. The anode of the fourth driving diode is connected to the second output terminal of the second rectifier module, and the cathode is connected to the second terminal of the output filter module. The two ends of the output filter module are connected to the auxiliary power supply.
4. The novel auxiliary power supply circuit according to claim 3, characterized in that, The power supply includes a first power terminal and a second power terminal. The first input terminal of the first rectifier module and the first input terminal of the second rectifier module are connected to the first power supply terminal; The second input terminal of the first rectifier module and the second input terminal of the second rectifier module are connected to the second power supply terminal.
5. The novel auxiliary power supply circuit according to claim 3, characterized in that, It further includes a third rectifier module, a third input filter module, and a third single-stage converter; The first and second input terminals of the third rectifier module are connected to the power supply, and the first and second output terminals are connected to the third input filter module. The third input filter module is connected to the third single-stage converter.
6. The novel auxiliary power supply circuit according to claim 5, characterized in that, The power supply includes a first power terminal, a second power terminal, and a third power terminal; The first input terminal of the first rectifier module is connected to the first power supply terminal, and the second input terminal is connected to the second power supply terminal. The first input terminal of the second rectifier module is connected to the first power supply terminal, and the second input terminal is connected to the third power supply terminal; The first input terminal of the third rectifier module is connected to the first power supply terminal, and the second input terminal is connected to the third power supply terminal.
7. The novel auxiliary power supply circuit according to any one of claims 3 to 6, characterized in that, The output filtering module includes a first output filtering capacitor and a second output filtering capacitor; The positive terminal of the first output filter capacitor is connected to the cathode of the first driving diode and / or the cathode of the third driving diode; the negative terminal of the first output filter capacitor is connected to the positive terminal of the second output filter capacitor. The negative terminal of the second output filter capacitor is connected to the anode of the second driving diode and / or the anode of the fourth driving diode.
8. The novel auxiliary power supply circuit according to any one of claims 1 to 6, characterized in that, The rectifier module includes a diode rectifier bridge; and / or the input filter module includes two filter capacitors connected in series.
9. The novel auxiliary power supply circuit according to any one of claims 1 to 6, characterized in that, The single-stage converter includes a transformer, a DAB module connected to the primary winding of the transformer, and a secondary output module connected to the secondary winding of the transformer.
10. The novel auxiliary power supply circuit according to claim 9, characterized in that, The DAB module includes a primary-side switching transistor unit, a DC blocking capacitor, and an energy storage inductor. The first input terminal of the primary-side switching transistor unit is connected to the first output terminal of the rectifier module, the second input terminal is connected to the second output terminal of the rectifier module, the first output terminal is connected to the first terminal of the primary winding of the transformer via the energy storage inductor, and the second output terminal is connected to the second terminal of the primary winding of the transformer via the energy storage inductor.