CN212875685U - Direct current voltage conversion circuit - Google Patents
Direct current voltage conversion circuit Download PDFInfo
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- CN212875685U CN212875685U CN202021378756.7U CN202021378756U CN212875685U CN 212875685 U CN212875685 U CN 212875685U CN 202021378756 U CN202021378756 U CN 202021378756U CN 212875685 U CN212875685 U CN 212875685U
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 7
- 239000003990 capacitor Substances 0.000 claims description 23
- 238000001914 filtration Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
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Abstract
本实用新型是直流电压转换电路。该直流电压转换电路包含第一RC电路、晶体管及第二RC电路，该第一RC电路接收输入信号，该第一RC电路用以对该输入信号滤波而输出滤波信号，该晶体管耦接该第一RC电路以接收该滤波信号，该晶体管输出整流信号，该第二RC电路电性连接该晶体管以接收该整流信号，该第二RC电路用以对该整流信号滤波而输出直流电压信号。
The utility model is a direct current voltage conversion circuit. The direct current voltage conversion circuit comprises a first RC circuit, a transistor and a second RC circuit, wherein the first RC circuit receives an input signal, the first RC circuit is used to filter the input signal and output a filtered signal, the transistor is coupled to the first RC circuit to receive the filtered signal, the transistor outputs a rectified signal, the second RC circuit is electrically connected to the transistor to receive the rectified signal, and the second RC circuit is used to filter the rectified signal and output a direct current voltage signal.
Description
Technical Field
The present invention relates to a converter circuit, and more particularly to a dc voltage converter circuit.
Background
A general fan circuit board is provided with a microprocessor, which is used to output a PWM (Pulse-Width Modulation) signal to a stator coil of the fan, so that the stator generates a magnetic field to drive a fan rotor to rotate, and the Duty cycle of the PWM signal is adjusted to change the rotation speed of the fan rotor, but if other circuits or stators on the fan circuit board need a stable dc voltage, a dc voltage chip needs to be additionally provided to convert the dc voltage, so that the manufacturing cost of the fan is increased.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides direct current voltage conversion circuit to convert the PWM signal into direct current voltage signal.
The utility model discloses a direct current voltage converting circuit contains first RC circuit, transistor and second RC circuit, and input signal is received to this first RC circuit, and this first RC circuit is used for outputting the filtering signal to this input signal filtering, and this transistor coupling this first RC circuit is in order to receive this filtering signal, and this transistor output rectification signal, this transistor of this second RC circuit electric connection is in order to receive this rectification signal, and this second RC circuit is used for outputting direct current voltage signal to this rectification signal filtering.
Preferably, the first RC circuit has a first resistor and a first capacitor, one end of the first resistor receives the input signal, the other end of the first resistor is electrically connected to one end of the first capacitor, and the other end of the first capacitor is grounded.
Preferably, the filter circuit comprises a current limiting resistor, one end of the current limiting resistor is electrically connected to the first RC circuit to receive the filtered signal, and the other end of the current limiting resistor is electrically connected to the transistor.
Preferably, the transistor is an NPN-type bipolar transistor, a collector of the transistor is electrically connected to the current-limiting resistor, a base of the transistor is electrically connected to the first RC circuit, and an emitter of the transistor is electrically connected to the second RC circuit.
Preferably, the transistor is an NPN-type bipolar transistor, a collector and a base of the transistor are electrically connected to the first RC circuit, and an emitter of the transistor is electrically connected to the second RC circuit.
Preferably, the second RC circuit has a second resistor and a second capacitor, one end of the second resistor is electrically connected to the transistor, the other end of the second resistor is electrically connected to one end of the second capacitor, and the other end of the second capacitor is grounded.
Preferably, the first RC circuit and the second RC circuit are low-pass filter circuits.
The utility model discloses borrow and filter and the rectification by this first RC circuit, this transistor and this second RC circuit to this input signal, and this direct voltage signal of exportable stability owing to need not set up the direct voltage chip and can provide direct voltage, can reduce the cost of manufacture of whole fan.
Drawings
FIG. 1: according to an embodiment of the present invention, a circuit diagram of the dc voltage converting circuit.
[ description of main element symbols ]
100 direct current voltage conversion circuit 110 first RC circuit
111 first resistor 112 first capacitor
120 transistor 130 second RC circuit
131, a second resistor 132, a second capacitor
140 current limiting resistor SinInput signal
SfFiltered signal SrRectified signal
SdcA DC voltage signal B, a base
C collector E emitter
Detailed Description
Referring to fig. 1, which is a circuit diagram of a dc voltage converting circuit 100 according to an embodiment of the present invention, the dc voltage converting circuit 100 includes a first RC circuit 110, a transistor 120, a second RC circuit 130, and a current limiting resistor 140.
In the embodiment, the first RC circuit 110 has a first resistor 111 and a first capacitor 112, and one end of the first resistor 111 receives the input signal SinThe other end of the first resistor 111 is electrically connected to one end of the first capacitor 112, and the other end of the first capacitor 112 is grounded. The input signal S received by the first resistor 111inFor fan processor inputThe output PWM (Pulse-Width Modulation) signal, in other embodiments, the input signal SinBut may also be a generally non-modulated square wave signal. Wherein the first resistor 111 and the first capacitor 112 form a low-pass filter circuit to filter the input signal SinFiltering out medium high frequency component to output filter signal SfThe filtered signal S obtained by filteringfIs a Ripple (Ripple) with a slightly glitch waveform.
One end of the current limiting resistor 140 is electrically connected to the first RC circuit 110 for receiving the filtered signal SfThe other end of the current limiting resistor 140 is electrically connected to the transistor 120, and the filtered signal S output by the first RC circuit 110fIs transmitted to the transistor 120 through the current limiting resistor 140, thereby reducing the filtered signal SfTo avoid the filtered signal SfIs too large and causes damage to the transistor 120.
In this embodiment, the Transistor 120 is a NPN Bipolar Transistor (BJT), the Transistor 120 has a base B, a collector C and an emitter E, the collector C of the Transistor 120 is electrically connected to the current-limiting resistor 140 and coupled to the first RC circuit 110 through the current-limiting resistor 140, the base B of the Transistor 120 is electrically connected to the first RC circuit 110, and the emitter E of the Transistor 120 is electrically connected to the second RC circuit 130. Wherein the collector C and the base B of the transistor 120 both receive the filtered signal S of the first RC circuit 110fThe transistor 120 is used as a diode to filter the signal SfRectified and the emitter E outputs a rectified signal SrTo the second RC circuit 130. The transistor 120 acting as a diode can prevent the reverse current from the second RC circuit 130 from affecting the level of the front-end circuit output signal, such as the PWM signal output by the fan processor in this embodiment.
The second RC circuit 130 has a second resistor 131 and a second capacitor 132, one end of the second resistor 131 is electrically connected to the emitter E of the transistor 120, the other end of the second resistor 131 is electrically connected to one end of the second capacitor 132, the other end of the second capacitor 132 is grounded, and the other end of the second capacitor 132 is groundedThe second RC circuit 130 outputs a dc voltage signal S from the other end of the second resistor 131dc. Wherein the second resistor 131 and the second capacitor 132 form a low-pass filter circuit, and the second RC circuit 130 further rectifies the rectified signal SrFiltering out the high frequency component to make the DC voltage signal S output by the second RC circuit 130dcHas stable DC voltage level and the DC voltage signal SdcIs in direct proportion to the duty cycle of the PWM signal, and the DC voltage signal S can be changed by adjusting the duty cycle of the PWM signaldcThe magnitude of the potential of (2).
The utility model discloses borrow by this first RC circuit 110, this transistor 120 and this second RC circuit 130 to this input signal SinFiltering and rectifying to output stable DC voltage signal SdcBecause the direct current voltage can be provided without arranging a direct current voltage chip, the manufacturing cost of the whole fan can be reduced.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention has been disclosed with the preferred embodiment, it is not limited to the present invention, and any skilled person in the art can make modifications or changes equivalent to the equivalent embodiment of the above embodiments without departing from the scope of the present invention, but all the modifications, changes and modifications of the above embodiments by the technical spirit of the present invention are within the scope of the present invention.
Claims (7)
1. A dc-to-voltage conversion circuit, comprising:
a first RC circuit for receiving an input signal, the first RC circuit being configured to filter the input signal and output a filtered signal;
a transistor coupled to the first RC circuit to receive the filtered signal, the transistor outputting a rectified signal; and
the second RC circuit is electrically connected with the transistor to receive the rectification signal, and is used for filtering the rectification signal and outputting a direct-current voltage signal.
2. The dc voltage converting circuit of claim 1, wherein the first RC circuit has a first resistor and a first capacitor, one end of the first resistor receives the input signal, the other end of the first resistor is electrically connected to one end of the first capacitor, and the other end of the first capacitor is grounded.
3. The dc voltage converting circuit of claim 1, comprising a current limiting resistor, wherein one end of the current limiting resistor is electrically connected to the first RC circuit for receiving the filtered signal, and the other end of the current limiting resistor is electrically connected to the transistor.
4. The DC voltage converting circuit of claim 3, wherein the transistor is an NPN-type bipolar transistor, a collector of the transistor is electrically connected to the current limiting resistor, a base of the transistor is electrically connected to the first RC circuit, and an emitter of the transistor is electrically connected to the second RC circuit.
5. The dc voltage converting circuit of claim 1, wherein the transistor is an NPN-type bipolar transistor, a collector and a base of the transistor are electrically connected to the first RC circuit, and an emitter of the transistor is electrically connected to the second RC circuit.
6. The dc voltage converting circuit of claim 1, wherein the second RC circuit has a second resistor and a second capacitor, one end of the second resistor is electrically connected to the transistor, the other end of the second resistor is electrically connected to one end of the second capacitor, and the other end of the second capacitor is grounded.
7. The DC-to-DC converter circuit of claim 1, wherein the first and second RC circuits are low-pass filters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021378756.7U CN212875685U (en) | 2020-07-14 | 2020-07-14 | Direct current voltage conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021378756.7U CN212875685U (en) | 2020-07-14 | 2020-07-14 | Direct current voltage conversion circuit |
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| Publication Number | Publication Date |
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| CN212875685U true CN212875685U (en) | 2021-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021378756.7U Active CN212875685U (en) | 2020-07-14 | 2020-07-14 | Direct current voltage conversion circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113436586A (en) * | 2021-08-04 | 2021-09-24 | 上海商米科技集团股份有限公司 | PWM voltage control circuit and method |
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2020
- 2020-07-14 CN CN202021378756.7U patent/CN212875685U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113436586A (en) * | 2021-08-04 | 2021-09-24 | 上海商米科技集团股份有限公司 | PWM voltage control circuit and method |
| CN113436586B (en) * | 2021-08-04 | 2023-04-25 | 上海商米科技集团股份有限公司 | PWM voltage control circuit and method |
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