Wide voltage power supply circuit and sensor

Abstract

The utility model discloses a wide-voltage power supply circuit which comprises a filter circuit and a voltage conversion circuit. The input ends of the external power supply, the filter circuit and the voltage conversion circuit are electrically connected in sequence; the voltage conversion circuit comprises an inductor assembly, a capacitor assembly, a capacitor C6 and a voltage conversion chip U2; the voltage conversion circuit is provided with two input ends and an output end, and the two input ends are respectively a positive input end J14 and a negative input end J15; one output end VDD is used for outputting 0V-+ 5V voltage; the voltage conversion chip U2 is provided with three pins which are VIN, GND and V +, and the inductance assembly is arranged between the VIN pin and the positive electrode input end J14 in series. The GND pin and the negative electrode input end J15 are electrically connected and are both grounded; the capacitor C6 is arranged between the VIN pin and the GND pin in parallel; one end of the capacitor assembly is grounded, and the other end is electrically connected with the V + pin; according to the utility model, while localization is carried out, the input voltage range is a wide voltage ranging from + 12VDC to + 34VDC, and the output is stable from 0V to + 5V.

Description

Technical Field

[0001] This utility model belongs to the field of sensor technology, specifically relating to a wide voltage power supply circuit and sensor. Background Technology

[0002] The input voltage range of a pressure sensor depends on the power supply chip in the signal conditioning circuit. The power supply chip converts different ranges of input voltage into a stable output voltage for the operation of downstream electronic equipment, while also providing overvoltage and overcurrent protection.

[0003] The current situation requires a domestically produced, miniaturized pressure sensor with a wide input voltage range of +12VDC to +34VDC, a stable output voltage of 0V to +5V, adaptability to external power supply ripple ≤600mV, the ability to withstand harsh external power supply environments, continuous operation for ≥24 hours, and normal operation for ≥6 hours at a high temperature of 60℃.

[0004] Conventional power supply chips have an input voltage range of 7–20V and cannot withstand a wide voltage supply range; if the input voltage exceeds 20V, secondary voltage regulation of the power supply chip is required. (See appendix for details.) Figure 1 The internal space of the sensor structure is limited (generally, the size of a pressure sensor is < Internal circuit layout diameter ≤ This makes it impossible to install a secondary voltage regulator circuit. Furthermore, conventional power supply chips are designed for external power supply ripple of less than 60mV, while power supply circuits with large ripple and high noise levels are prone to electromagnetic interference. Additionally, conventional power supply chips use imported components, not domestically produced ones.

[0005] In summary, conventional power supply chips cannot meet the aforementioned practical requirements. Utility Model Content

[0006] In view of this, the present invention provides a wide voltage power supply circuit. While the circuit is domestically produced, it has a wide input voltage range of +12VDC to +34VDC, a stable output of 0V to +5V, and adapts to external power supply ripple of ≤600mV. It also enables the sensor to withstand harsh external power supply environments, work continuously for ≥24 hours, and work normally for ≥6 hours at a high temperature of 60℃.

[0007] This utility model is achieved through the following technical solution:

[0008] A wide voltage power supply circuit includes: a filter circuit and a voltage conversion circuit;

[0009] The input terminals of the external power supply, filter circuit, and voltage conversion circuit are connected in sequence; the filter circuit is used to suppress electromagnetic interference, and the voltage conversion circuit is used to convert a wide voltage range of +12VDC to +34VDC to 0V to +5V output.

[0010] The voltage conversion circuit comprises an inductive component, a capacitive component, a capacitor C6 and a voltage conversion chip U2; the voltage conversion circuit has two input terminals and one output terminal, the two input terminals are a positive input terminal J14 and a negative input terminal J15 respectively; one output terminal VDD is used for outputting 0V~+5V voltage;

[0011] The voltage conversion chip U2 is provided with three pins, which are VIN, GND and V+ respectively; the inductive component is connected in series between the VIN pin and the positive input terminal J14, and the inductive component comprises inductors R2 and R3 connected in parallel;

[0012] The GND pin is electrically connected with the negative input terminal J15, and both are connected with the ground;

[0013] The capacitor C6 is connected in parallel between the VIN pin and the GND pin;

[0014] One end of the capacitive component is connected with the ground, and the other end is electrically connected with the V+ pin; the capacitive component comprises capacitors C5 and C14 connected in parallel.

[0015] Further, the voltage conversion chip U2 adopts a JW7805 chip.

[0016] Further, the filter circuit comprises a positive input terminal J8, a negative input terminal J11, a positive output terminal J12, a negative output terminal J18, a capacitor C12, a magnetic bead FB2, a magnetic bead FB3, a capacitor CY10 and a capacitor CY11;

[0017] The positive pin of the capacitor C12 is electrically connected with the positive input terminal J8, and the negative pin is electrically connected with the negative input terminal J11;

[0018] The capacitor CY10 comprises two pins, which are pin A and pin B respectively, the pin A is electrically connected with the positive output terminal J12, and the pin B is connected with the ground; the capacitor CY11 comprises two pins, which are pin C and pin BD respectively, the pin C is electrically connected with the negative output terminal J18, and the pin D is connected with the ground;

[0019] The magnetic bead FB2 is electrically connected between the positive pin of the capacitor C12 and the pin A of the capacitor CY10, and the magnetic bead FB3 is electrically connected between the negative pin of the capacitor C12 and the pin C of the capacitor CY11.

[0020] Further, the filter circuit further comprises a system ground connection terminal J9, and the negative input terminal J11 is commonly grounded with the system ground connection terminal J9.

[0021] A sensor based on a wide voltage power supply circuit, comprising the wide voltage power supply circuit, a signal conditioning chip and a sensitive core body;

[0022] The wide voltage power supply circuit is electrically connected with the signal conditioning circuit, and is used for providing a stable +5VDC working power supply for the signal conditioning chip.

[0023] The signal conditioning chip is electrically connected with the sensitive core body, and is used for providing an excitation current for the sensitive core body and receiving and amplifying an output signal of the sensitive core body.

[0024] Further, the signal conditioning chip adopts an HKA2910 chip.

[0025] Beneficial effects:

[0026] (1) The wide voltage power supply circuit of the utility model, after the external power supply is filtered through the filter circuit, and then is further filtered through the inductance R2, R3 and the capacitance C6, can effectively reduce the noise, reduce the electromagnetic interference, and the voltage conversion chip U2 used in the utility model can convert the wide voltage of +12VDC~+34VDC to 0V~+5V, can realize the wide voltage of the power supply circuit, need not set up the voltage stabilizing circuit, reduce the occupied space of the circuit.

[0027] (2) The utility model discloses a voltage conversion chip U2 adopts JW7805 chip. Firstly, JW7805 chip is the chip of domestic product, secondly, JW7805 chip can resist the input wide voltage range of +12VDC~+34VDC, and can continuously stably output 4.982V voltage, finally, the working temperature range of JW7805 chip is -55 DEG C~125 DEG C, and the storage temperature range is -65 DEG C~+150 DEG C, has the advantage that the working temperature range is wide.

[0028] (3) The utility model sets up the filter circuit between the voltage conversion circuit and the external power supply, and is combined with the filtering function of the voltage conversion circuit, can reduce the noise, adapt to the ripple of external power supply ≤600mV, and inhibit electromagnetic interference.

[0029] (4) The sensor in the utility model adopts the wide voltage power supply circuit, need not set up secondary voltage stabilizing circuit, save the internal space of sensor, and the signal conditioning chip in the sensor can obtain stable 5V voltage input, the sensor can resist the external harsh power supply environment, and the continuous work of one time ≥24h, and can work normally ≥6h under high temperature 60 DEG C. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is the pressure sensor shell;

[0031] Figure 2 It is the filter circuit of the utility model;

[0032] Figure 3 It is the voltage conversion circuit of the utility model; DETAILED DESCRIPTION

[0033] The utility model is described in detail below with reference to the drawings and examples.

[0034] Example 1

[0035] The embodiment provides a wide voltage power supply circuit for converting +12VDC~+34VDC voltage of an external power supply into 0V~+5V output.

[0036] Referring to the accompanying Figure 2 and the accompanying Figure 3 The wide voltage power supply circuit comprises a filter circuit and a voltage conversion circuit.

[0037] The input ends of the external power supply, the filter circuit and the voltage conversion circuit are sequentially and electrically connected; the filter circuit is used for suppressing electromagnetic interference, and the voltage conversion circuit is used for converting the wide voltage of +12VDC~+34VDC into 0V~+5V output.

[0038] The voltage conversion circuit comprises an inductor component, a capacitor component, a capacitor C6 and a voltage conversion chip U2; the voltage conversion circuit has two input ends and one output end, the two input ends are a positive input end J14 and a negative input end J15 respectively; one output end VDD is used for outputting 0V~+5V voltage; in a specific embodiment, the output end VDD outputs +5V voltage.

[0039] The voltage conversion chip U2 is provided with three pins, namely VIN, GND and V+, the inductor component is connected in series between the VIN pin and the positive input end J14, and the inductor component comprises inductor R2 and inductor R3 connected in parallel; the GND pin is electrically connected with the negative input end J15 and both are connected with the ground.

[0040] The capacitor C6 is connected in parallel between the VIN pin and the GND pin.

[0041] One end of the capacitor component is connected with the ground, and the other end is electrically connected with the V+ pin; the capacitor component comprises capacitor C5 and C14 connected in parallel.

[0042] The wide voltage power supply circuit provided in the embodiment can effectively reduce noise and electromagnetic interference by filtering the external power supply through the filter circuit and then filtering through the inductors R2 and R3 and the capacitor C6. Moreover, the voltage conversion chip U2 used in the embodiment can convert the wide voltage of +12VDC~+34VDC into 0V~+5V, so that the wide voltage of the power supply circuit can be realized, and a voltage stabilizing circuit does not need to be arranged, thereby reducing the occupied space of the circuit.

[0043] In one embodiment, the voltage conversion chip U2 adopts the JW7805 chip. First, the JW7805 chip is a domestic chip, which is conducive to the localization of the circuit; second, the JW7805 chip can withstand an input wide voltage range of +12VDC~+34VDC, and can continuously and stably output a voltage of 4.982V; finally, the working temperature range of the JW7805 chip is -55℃~125℃, the storage temperature range is -65℃~+150℃, it can work continuously for ≥24h at a time, and it can work normally for ≥6h at a high temperature of 60℃.

[0044] In one embodiment, the filter circuit includes a positive input end J8, a negative input end J11, a positive output end J12, a negative output end J18, a capacitor C12, a magnetic bead FB2, a magnetic bead FB3, a capacitor CY10 and a capacitor CY11.

[0045] The positive pin of the capacitor C12 is connected to the positive input end J8, and the negative pin is connected to the negative input end J11.

[0046] The capacitor CY10 includes two pins, pin A and pin B, pin A is connected to the positive output end J12, and pin B is connected to the ground; the capacitor CY11 includes two pins, pin C and pin D, pin C is connected to the negative output end J18, and pin D is connected to the ground.

[0047] The magnetic bead FB2 is electrically connected between the positive pin of the capacitor C12 and the pin A of the capacitor CY10, and the magnetic bead FB3 is electrically connected between the negative pin of the capacitor C12 and the pin C of the capacitor CY11.

[0048] The filter circuit provided in this embodiment is combined with the filtering function of the voltage conversion circuit, which can reduce noise, adapt to an external power supply ripple ≤600mV, and suppress electromagnetic interference.

[0049] Further, the filter circuit further includes a system ground connection end J9, and the negative input end J11 is connected to the system ground connection end J9.

[0050] Working principle: +12VDC~+34VDC of the external power supply is input from the positive input end J8 of the filter circuit, filtered by the filter circuit, and then filtered by the inductor R2, the inductor R3 and the capacitor C6, and electrically connected with the JW7805 chip. The JW7805 chip converts the filtered +12VDC~+34VDC voltage into +5V voltage.

[0051] Embodiment 2:

[0052] The embodiment provides a sensor, which includes a wide voltage power supply circuit, a signal conditioning chip and a sensitive core body in embodiment 1.

[0053] The wide voltage power supply circuit is electrically connected with the signal conditioning circuit, and is used for providing a stable +5VDC working power supply for the signal conditioning chip.

[0054] The signal conditioning chip is electrically connected with the sensitive core, and is used for providing an excitation current for the sensitive core and receiving and amplifying the output signal of the sensitive core.

[0055] In one embodiment, the signal conditioning chip adopts an HKA2910 chip, and the parameters in the configurable register are used to realize sensor output calibration, temperature error compensation amplification and temperature compensation.

[0056] Embodiment 3

[0057] This embodiment is based on Embodiment 2, and provides an embodiment for testing the sensor, which mainly includes the following three tests.

[0058] (1) The JW7805 power supply chip is tested at room temperature (indoor temperature: 28℃), and the test items include the power supply voltage, output voltage, output current and device surface temperature (including the heating condition), and the specific conditions are shown in Table 1.

[0059] Table 1 JW7805 room temperature (28℃) test condition table

[0060]

[0061] As can be seen from Table 1, at room temperature, when the JW7805 power supply voltage is 34V, a stable 4.968V voltage can be continuously output, and no failure occurs after continuous power supply for 24h, and the device surface temperature is about 50℃, and the device heat dissipation will not cause damage or failure of other devices (the working temperature range of other devices in the circuit is-55℃-125℃).

[0062] (2) The pressure sensor is placed in a high-low temperature test box, and the sensor is tested at high temperature to test the voltage output stability of JW7805 at high temperature. The temperature of the test box is increased to 60℃, and the output voltage of JW7805 is tested, and the test conditions are shown in Table 2.

[0063] Table 2 JW7805 high temperature (60℃) test condition table

[0064] Serial number Test time Supply voltage Output voltage Output current Remarks 1 17:38 34V 4.978V 8.177 mA 2 18:38 34V 4.981V 8.177 mA 3 19:38 34V 4.982V 8.177 mA 4 20:38 34V 4.982V 8.177 mA 5 21:38 34V 4.982V 8.177 mA 6 22:38 34V 4.982V 8.177 mA 7 23:38 34V 4.982V 8.177 mA

[0065] As can be seen from Table 2, in a 60℃ high temperature environment, when the JW7805 power supply voltage is 34V, a stable 4.982V voltage can be continuously output for 6h.

[0066] (3) At normal temperature (23℃), high temperature 60℃ and 70℃, the input voltage (12V and 34V) is adjusted, and the output voltage of JW7805 is tested, and the test conditions are shown in Table 3.

[0067] Table 3 Test conditions of JW7805 at different temperatures (23℃, 60℃ and 70℃)

[0068]

[0069] As can be seen from Table 3, at the same temperature point, when JW7805 is powered by +12V (lower limit) or 34V (upper limit) respectively, the output voltage of JW7805 is stable, the maximum deviation is 3mV, and the output current is stable.

[0070] Through the above test and analysis, JW7805 can provide a required power supply voltage for the rear-end circuit in the power supply range of +12V-34V.

[0071] In conclusion, the above is only a preferred embodiment of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A wide voltage supply circuit, characterized by, include: Filtering circuits and voltage conversion circuits; The input terminals of the external power supply, filter circuit, and voltage conversion circuit are connected in sequence. The filter circuit is used to suppress electromagnetic interference, and the voltage conversion circuit is used to convert a wide voltage range of +12VDC to +34VDC to 0V to +5V output. The voltage conversion circuit includes an inductor assembly, a capacitor assembly, capacitor C6, and a voltage conversion chip U2; the voltage conversion circuit has two input terminals and one output terminal, the two input terminals are the positive input terminal J14 and the negative input terminal J15; the output terminal VDD is used to output a voltage of 0V to +5V; The voltage conversion chip U2 has three pins, namely VIN, GND and V+. The inductor assembly is connected in series between the VIN pin and the positive input terminal J14. The inductor assembly includes inductors R2 and R3 connected in parallel. The GND pin is electrically connected to the negative input terminal J15, and both are connected to ground. Capacitor C6 is connected in parallel between the VIN pin and the GND pin; One end of the capacitor assembly is connected to ground, and the other end is electrically connected to the V+ pin. The capacitor assembly includes capacitors C5 and C14 connected in parallel.

2. The wide voltage supply circuit of claim 1, wherein The voltage conversion chip U2 uses the JW7805 chip.

3. A wide voltage supply circuit as claimed in claim 1 or 2, characterized in that The filter circuit includes a positive input terminal J8, a negative input terminal J11, a positive output terminal J12, a negative output terminal J18, a capacitor C12, a ferrite bead FB2, a ferrite bead FB3, a capacitor CY10, and a capacitor CY11. The positive terminal of capacitor C12 is connected to the positive input terminal J8 at the same potential, and the negative terminal is connected to the negative input terminal J11 at the same potential. Capacitor CY10 has two pins, pin A and pin B. Pin A is connected to the positive output terminal J12 at the same potential, and pin B is connected to ground. Capacitor CY11 has two pins, pin C and pin BD. Pin C is connected to the negative output terminal J18 at the same potential, and pin D is connected to ground. Ferrite bead FB2 is electrically connected between the positive terminal of capacitor C12 and pin A of capacitor CY10, and ferrite bead FB3 is electrically connected between the negative terminal of capacitor C12 and pin C of capacitor CY11.

4. The wide voltage supply circuit of claim 3, wherein, The filter circuit also includes a system ground connection terminal J9, and the negative input terminal J11 shares the same ground with the system ground connection terminal J9.

5. A sensor based on the wide voltage supply circuit according to any one of claims 1 to 4, characterized in that Includes the wide voltage power supply circuit, signal conditioning chip, and sensitive core; The wide voltage power supply circuit is electrically connected to the signal conditioning circuit. The wide voltage power supply circuit is used to provide a stable +5VDC operating power supply for the signal conditioning chip. The signal conditioning chip is electrically connected to the sensing chip. The signal conditioning chip is used to provide excitation current to the sensing chip and to receive and amplify the output signal of the sensing chip.

6. The sensor of claim 5, wherein, The signal conditioning chip used is the HKA2910 chip.

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